YELLOW FEVER.

BY S. M. BEMISS, M.D.

Yellow fever is a specific, infectious, and communicable disease of one febrile paroxysm.

This definition includes some of the most prominent characteristics of the disease. The malady, however, derives its name from a symptom not mentioned in the definition. The yellow color of the skin and scleroticæ which appears in advanced stages of grave cases of yellow fever, and which becomes especially marked in the cadaver, has ruled its nomenclature. Whatever objections may be urged against the term "yellow fever" as being founded upon a symptom of the disease not always present, it is too strongly fixed in both medical literature and popular usage to justify efforts to change it.

Neither is it liable to beget confusion as long as it is understood that it is to be restricted in its application to a specific fever induced by a specific poison, and that as an incident of its morbid process it produces yellow coloration of the surface so frequently as to suggest the prefix yellow to its title.

ETIOLOGY AND SYMPTOMATOLOGY.—In this day of almost general belief in the theory which holds that each specific disease has its own specific poison or morbific germ, it is scarcely expedient to occupy much space in discussing the propriety of classing yellow fever among the specific maladies.

Whether we rest the decision of this question upon the uniformity of those circumstances and conditions which originate and develop epidemics of yellow fever, or upon the sameness of its symptomatic phenomena wherever observed, we find very nearly as substantial claims to a specific individualization of the disease as any one of the eruptive fevers possesses. Not only are its morbid phenomena so characteristic that even non-professional observers designate it by such epithets as Bronze John, Yellow Jack, Vomito Prieto, etc., but it is inconvertible with other specific affections. This inconvertibility of yellow fever with other diseases is absolute, and affords irrefrangible evidence of the specificity of that germ or poisonous principle which produces it.

The study of yellow-fever poison after the objective method has hitherto been unproductive of definite results. When such experienced and truthful observers as Sternberg, Woodward, and Schmidt, working with the most approved microscopes, have failed to identify any organism or object peculiar to the products from the bodies of yellow-fever subjects or to the circumfusa of the sick, this declaration is sufficiently supported.

But when we turn to a subjective method of investigating that toxic agent which causes yellow fever, it is found to possess sufficiently well-marked characteristics to justify practically valuable conclusions. Some of these characteristics or modes of behavior merit notice.

1st. The human system is a field of reproduction and multiplication of yellow-fever poison. This is sufficiently established by two facts:

(a) A person in the incubative stage of yellow-fever intoxication may be divested of all fomites and yet originate other cases after a developed attack.

(b) The infection is intensified by aggregation of the sick.

These propositions are indisputably true.

2d. The poison or infection undergoes some change after leaving the human system. This appears to be susceptible of proof, because communication of the disease from person to person is not a common event. When this does apparently occur, there is often very strong reason for a belief that the contagion was resident in some fomites connected with the patient's bed or clothing.

3d. There are no sustained observations which prove that yellow-fever poison is ever created de novo.

The autochthonous birthplace of the poison is unknown. The suggestion of Niebuhr, that yellow fever may have been one of the causes of death during the plagues of Athens, can not be authoritatively denied. It may have been called into existence at the moment when all things else were created which were to perpetuate each its kind.

4th. Some of those conditions and circumstances which favor or retard the development or maturation of yellow-fever poison outside the human body are quite well understood. Warm, damp weather is most prominent among those climatic conditions which are favorable to the growth of yellow-fever epidemics.

5th. A freezing temperature ordinarily destroys the contagium of yellow fever. A high degree of artificial heat produces a similar result. It is highly probable that certain chemical agents would also effect its destruction if brought in contact with it.

6th. If yellow-fever fomites are hermetically enclosed in situations protected from cold or other agents which are destructive to their infection, its vitality may be preserved for an undetermined length of time, and its toxic qualities again made manifest when unacclimated persons are exposed to it.

7th. Yellow-fever poison possesses ponderability. This characteristic is so distinctly marked that it has been frequently termed a "low-lying poison."

8th. It is incapable of being air-borne through any great distance, at least without being deprived of its toxic effects.

9th. It is transportable in fomites through great distances, either on sea or land, and as often as its toxic effects are manifested after these portations they are so uniform as to be promptly recognizable.

A great number of different materials in common use may act as fomites, such as loose wool, cotton, or hair, or textile fabrics of various descriptions.

The following facts, which illustrate how yellow-fever infection may be conveyed in the most unsuspecting and innocent manner, are well authenticated. There can be no ground for accusation of error except in the hypothesis that the infection was encountered simultaneously in some unexplained manner. The facts are furnished by Dr. Shannon of Ocean Springs, Mississippi: "On the 14th of October, 1883, Maj. J. B. B. died of yellow fever in Ocean Springs, Miss. I moved the family at once to the healthy locality where you saw Miss B., not allowing them to take any article from the room where the husband and father had died. The children applied to me for a lock of their father's hair, which I refused, but the oldest daughter, now dead, prevailed upon the nurse to give it her. She placed it in an old envelope that had been torn open at the end and carefully folded the torn end down, thus practically sealing it, and laid it away among other old letters. On Sunday, the 4th of November, at 12.30 P.M., she brought this envelope out upon the open gallery, and opened it for the first time to examine the lock of hair and show it to her aunt, Miss S., who was visiting her, and upon inhaling the concentrated poison confined in the envelope and emanating from the hair, exclaimed, 'Oh, what a peculiar smell!' She then handed the envelope to her aunt, Miss S., who, unconscious of danger, also inhaled the 'messenger of death' with a similar exclamation, when Mrs. B., who was standing near, reached out her hand for the envelope, but was prevented from getting it by the entreaties of a fretful child to be taken up in her arms. This gave time for sufficient reflection, and she admonished the young ladies of the possible danger. The envelope was then carefully folded, and with its fatal contents replaced in the drawer where it had been since the 14th of October. This drawer had been almost daily opened. On the following Saturday night, Nov. 10th, at 9 P.M., Miss S. was taken sick with a chill, and Miss B. at about 2 A.M., some five hours later, the period of incubation being less than seven days in both cases. No other person handled the fatal envelope or in any way came in contact with it, and there is, after the most careful inquiry, no suspicion of any other source of infection in these two cases. Miss S. died on Oct. 14th, Miss B. on Oct. 16th."

10th. These qualities of yellow-fever infection, and especially its faculty of reproduction (which only organisms possess), furnish almost conclusive evidence that yellow fever is a germ disease produced by a specific contagium vivum.

Many facts are patent which sustain the generally accepted opinion that yellow-fever poison gains admission to the system through the medium of atmospheric air. On the other hand, I know of no observations which prove that the disease is ever communicated by food or drinks, or through any other vehicle than atmospheric air.

In respect to atmospheric infection by yellow fever, localizations of aërial impregnation are often observable, not common in other air-infecting diseases. A certain district of a large and populous city may become the seat of a sweeping and fatal epidemic, and yet no case occur outside of this area of prevalence. It is customary to speak of these points of epidemic prevalence as infected localities. If unprotected persons visit such infected places, even for a short period of time, they are liable to attacks of yellow fever, although they may take neither food nor drink within the limits of infection and bring no fomites away with them. Under these circumstances atmospheric impregnation is conclusive.

But it is difficult to determine how this infection of a locality has been produced in the first place, and how, in the second place, it is maintained sometimes for periods of from one to three months, with so little apparent diminution or change in the liability to communicate yellow fever to unprotected visitors within the limits of infection.

It seems highly probable that yellow-fever poison, after its exit from the human body, attaches itself to various solid surfaces in proximity to the sick, where, under suitable climatic conditions, it undergoes more or less speedy processes of maturation in toxic qualities. The poison thus matured is capable of being preserved with but little change for the periods indicated above, and is communicable through the atmosphere for short distances. It is also capable, by virtue of some unexplained process or quality, of spontaneously extending its area of infection. But this is at all times slow, and is readily interrupted by streams of water, high walls, or even by much-travelled thoroughfares.

There are no instances in which the water-supply of cities has been shown to have distributed yellow fever.

The periods of time which may intervene between exposure to yellow-fever poison and attacks of the disease are extremely variable. The shortest period of incubation which has come under my observation was about twenty hours. In three cases in which I was able to fix the hours of first exposure with precision attacks followed in 72 hours, 83 hours, and 101 hours, respectively. Of 55 unacclimated physicians who exposed themselves at Memphis during the epidemic of 1878, 54 suffered attacks of yellow fever. In these cases the periods of incubation varied from one to twenty-five days, the average duration being ten days. These physicians all remained steadfastly at their posts of duty; consequently, the attack which occurred on the twenty-fifth day was postponed for that length of time during constant exposure in a locality most intensely infected.

It must be true that many cases of individual resistance to the effects of yellow-fever infection depend upon states of the system or idiosyncrasies which diminish liability to the action of the poison. In other words, their personal receptivity to it is lessened by certain constitutional states.

That this position is correctly taken is proved by the fact that many circumstances which violently disturb the system determine attacks in persons who may have for a long time enjoyed immunity from them. Anxiety, grief, fright, fatigue, or exposure to sudden wettings or cold may precipitate attacks, either by disturbing vital processes by which the system is ridding itself of the poison—so far, at least, as to prevent an accumulation great enough to occasion attacks—or by lowering powers of resistance through enfeeblement of nerve-force.

But it can be affirmed in regard to yellow-fever poison that it is not more capricious or eccentric in its behavior as an infection than that of scarlet fever. Each of these diseases may appear in a large family of unprotected persons with a degree of violence which results in death in every instance, and suddenly cease, leaving a greater or less number of the household without attacks, though equally exposed with those who have died.

One attack of yellow fever confers immunity from the disease during after life. A person who has suffered an attack is said to be acclimated or protected. Neither of these terms should be applied to those who have not suffered attacks, however long they may have withstood exposure during epidemics. It often occurs that persons who have escaped attacks through many years of renewed exposure at last succumb to the disease. On the other hand, I know of three well-authenticated instances of immunity in a sweeping epidemic of persons whose mothers had suffered attacks during the gestations which respectively resulted in their births.

While negroes are susceptible to yellow-fever infection, attacks are far less fatal than among whites.

SYMPTOMS IN MILD OR SIMPLE CASES.—Yellow fever is usually sudden in its onset. Persons are liable to be seized while pursuing their ordinary avocations, or, as often occurs, the attack may begin during the night. The initial symptoms are chilliness or cold sensations, seldom amounting to a decided rigor. Reaction is usually prompt and decided, the temperature reaching within a few hours 102° to 105° F. Yellow fever is not a disease in which it is very common to observe excessive body heat.

As the fever is established, the countenance becomes flushed and the eyes injected and glistening. Frontal headache and lumbar pain are experienced very early in the attack, and are liable to become more intense during the progress of the fever. Muscular neuralgias, especially in the lower extremities, are not uncommon.

During the early period of the attack the tongue is indifferent as a symptom. It is generally moist and free from any coating. In cases attended by much furring of the tongue careful investigation is pretty sure to disclose the fact that it has been brought about by some pre-existing state of disease.

The bowels are generally inactive, though naturally impressible to cathartic drugs. The stomach is querulous from the inception of the attack to its conclusion. Vomiting may not occur spontaneously, but it is easily provoked by repletion of the stomach with any description of ingesta or by harsh or disgusting medicines. The acts of emesis are sudden and short in duration. Bile is a very uncommon constituent of the matters ejected. Whether vomiting has occurred or not, patients nearly always express repugnance to the weight of the physician's hand over the epigastrium. In the very mildest cases it seems to excite gastric distress and a tendency to emesis. The stomach and bowels are liable to distension by flatus, sometimes to the extent of producing colicky pains. Gaseous eructations are common.

During and shortly succeeding the cold stage the urine may be somewhat increased in amount, but after the fever is established both the quantity and the specific gravity are notably lessened. Albumen seldom appears in the urine during the first twenty-four hours of an attack. In very mild cases it is altogether absent throughout.

Delirium is not unusual during the fever. Among children attacks are often ushered in by convulsions. In such cases delirium may be persistent and alarming in violence.

The pulse in the early stage of yellow fever is slower in proportion to the temperature than in most other acute diseases. This is more especially true in respect to mild cases. Another characteristic feature of the pulse in yellow fever is that it declines in frequency before the fever has reached its maximum. In the mildest forms of the disease the temperature will attain its highest record within twelve hours. It then rapidly defervesces, never to return again. But in some cases of a moderately mild form the body heat does not reach its acme of intensity until the second day, occasionally not until the third or fourth day. In these cases also the pulse is apt to decline in frequency before the fever has culminated. There are therefore no fixed laws which govern the duration of the hot stage of yellow fever. Those which relate to the pulse are more uniform.

The following clinical reports of two cases support this statement. The detailed account of the symptoms establishing their diagnosis as mild cases of yellow fever is omitted.

Susie W——, white, aged seventeen years, was admitted to Charity Hospital on August 28, 1878. First observation, nine hours after the beginning of the attack, pulse 100, temperature 104.6°. Morning of 29th, pulse 94, temperature 102.8°; evening, pulse 80, temperature 101.5°. Sanguineous discharge from vagina began on 29th; patient supposed it to be her proper period. Aug. 30th, pulse 80, temperature 99.2°; convalescent and dismissed from further observations. In this case the urine presented a trace of albumen early on the second day, but as the menses appeared shortly after the urine was obtained, the presence of albumen may be in that manner accounted for.

Bessie L——, white, age twenty-seven years, admitted to Charity Hospital on August 28, 1878. First observation, twelve hours after beginning of attack, pulse 100, temperature 100.6°. 29th, pulse 76, temperature 102.3°. 30th, pulse 64, temperature 101.5°. Sanguineous discharge from vagina began on 30th and continued until Sept. 4th; this was two weeks before the patient's regular period. The urine showed traces of albumen at date of admission. Discharged, cured, Aug. 31st.

It may also be stated of the pulse of yellow fever that it is easily compressible and often gaseous in character.

Perspiration is probably an incident in the natural clinical history of a case of yellow fever. It occurs spontaneously if the patient's surface is protected from those influences which conflict with its appearance. It is not critical in any sense of the word, and may coexist with high temperature.

Yellow fever is considered to have two clinical stages. The first is the paroxysm. This is made to include the cold stage and succeeding fever. The cold stage is often almost or quite inappreciable, and when this is not the fact it is in simple cases a very unimportant event. It is therefore quite convenient to include it with the fever under the term paroxysm. The paroxysm of a simple case is terminated by a subsidence of the fever to nearly or quite a normal temperature. Sometimes the temperature falls below the normal standard.

The neuralgias and subjective sufferings are greatly mitigated or cease altogether. Thirst and restlessness are relieved, and the patient sees before him a delicious, but too often treacherous, mirage of restoration to perfect health. This is termed the stage of calm, perhaps because it often precedes a tempest of fatal symptoms.

In mild cases convalescence begins at the termination of the paroxysm, and may proceed without interruption until complete re-establishment of health has been accomplished. But in the very mildest cases the process of recovery is easily interrupted.

In these simple forms the tendency to hemorrhage first manifests itself in the calm stage. The gums become red, tumid, and spongy, the tongue pointed and red at the tip. Epistaxis is liable to occur. The eyes and skin may be slightly yellow, and the urine may show traces of albumen. However mild the other symptoms may appear, the tendency to hemorrhage, to albuminous urine, and to jaundice in the calm stage bears a direct relation in frequency of occurrence and in degree to the blood-stasis, or sluggish capillary circulation, of the first stage.

The foregoing is a recital of the clinical phenomena of typical and simple forms of yellow fever. The departures from type have been divided by different writers into a variety of forms. The most important of these will be referred to in connection with suggestions as to treatment.

PROGNOSIS.—Prognosis is variable in different epidemics, this observation being understood to apply to the same localities. Some of those circumstances which affect epidemic force, so as to increase the mortality-rate, are appreciable. If an epidemic invades a population after an interval of exemption sufficiently long to allow a large number of unprotected persons to have accumulated in its midst, the crowding of the sick will increase the death-rate. We may naturally assume that this is attributable, first, to sheer multiplication of the infection; second, to lack of proper attention to the sick, and to fright, grief, exhaustion, etc.

Tabulated Abstract of Practice in Yellow-Fever Epidemic of 1878, New Orleans Charity Hospital.

AGES. July. August. September. October. Total. Per
cent.
White. No.
treated.		 No.
fatal.		 No.
treated.		 No.
fatal.		 No.
treated.		 No.
fatal.		 No.
treated.		 No.
fatal.		 No.
treated.		 No.
fatal.
Under 5 ... ... 7 3 3 1 ... ... 10 4 40.0
5 to 10 ... ... 2 1 1 1 ... ... 3 2 66.66
10 to 20 8 3 26 7 25 6 7 ... 66 16 24.2
20 to 40 18 9 246 141 175 91 61 24 500 265 53.0
40 to 60 9 6 75 45 83 45 18 10 185 106 57.3
60 to 80 2 2 7 6 5 1 1 1 15 10 66.66
Total. 37 20 363 203 292 145 87 35 779 403 51.7
Black.
10 to 20 ... ... 2 ... 5 ... 1 ... 8 ...
20 to 40 ... ... 11 3 8 1 5 1 24 5 20.8
40 to 60 ... ... 2 1 1 1 3 1 6 3 50.0
Total. ... ... 15 4 14 2 9 2 38 8 21.0
Grand total. 817 411 50.3

Prognosis is especially bad in hospital practice. The foregoing statistics of cases admitted to the Charity Hospital of New Orleans during the greater part of the epidemic of 1878 illustrate the usual results of hospital practice.

Many of these patients were conveyed to the hospital in extreme conditions; occasionally they were moribund on admission. It is hazardous to the life of a yellow-fever patient to transfer him over the rough streets of a city, often for two or three miles, unless this is done in the very earliest hours of the attack.

Prognosis is seriously influenced by the condition of the patient at the moment of attack. If pregnancy exists or delivery has just occurred, it is, under most circumstances, extremely unfavorable. Fatigue, anxiety, despair, or grief, all render prognosis more gloomy.

The march of temperature is also important in determining fatal results.

The following statistics show the influence of temperature in relation to mortality from yellow fever:

First
day.		Died.Second
day.		Died.Third
day.		Died.Fourth
day.		Died.Fifth
day.		Died.
106°......321122......
105°9354252222
104°18102313832232
103°14411822312...

It will be seen from this table that the danger line of temperature in yellow fever descends as the case progresses.

It may again be stated that yellow fever, like scarlet fever, exhibits such striking contrasts in its mortality-rate that it is hardly possible to assert any average standard. It is true that in this disease, as in all others, statistical accumulations tend to correct their own errors in exact proportion to the magnitude of the collections.

In 1878 some 36,000 cases occurred in Louisiana, of which number not less than 6000 were fatal, a percentage of 16.66. The results of private practice in New Orleans are exhibited in the following statistics: Four of the principal practitioners in the city treated in private practice 975 patients—909 white and 66 colored. Of the former, 92, or 10.11 per cent., died; of the colored only 2 died. The cases and deaths among the whites, classified by age, were as follows:

AGE.Cases.Deaths.Per cent.
Under 5 years of age2062612.67
From 5 to 10 years of age233208.61
From 10 to 20 years of age18394.9
From 20 to 40 years of age2323916.7
From 40 to 60 years of age47612.7
From 60 to 80 years of age4250

The physicians above quoted lived in different parts of the city. All of them extended their visits and professional services to the sick to the very limits of physical endurance, and consequently included in the above lists some patients who were not able to procure the comforts and attention necessary to the sick. Some cases also were included to which the physician was only brought that he might sign the death-certificate and so avoid the coroner's inquest. After making allowance for increase of mortality on these scores, I think it safe to assert that the best results obtained in private practice varied from 7 to 10 per cent. of mortality-rate.

DIAGNOSIS.—While there is no one symptom pathognomonic of yellow fever in every stage of the disease, its differential diagnosis is nearly always possible. The morbid action of its special poison produces phenomena sufficiently characteristic to prove its presence. The sudden attack, the slight cold stage, the frontal and lumbar pain, and the capillary congestion are important diagnostic symptoms.

Even in mild attacks this capillary blood-stasis is usually sufficient to alter the patient's countenance to such a degree as to attract attention. A great many different adjectives are used in description of the countenances of yellow-fever patients. While no one among them is constantly applicable, the presence of a changed facial expression should enlist the physician's attention and incite investigation. If this altered countenance be associated with watery or glistening injected eyes, the probability of yellow fever is increased.

The slow pulse which coexists with elevated temperature is a point of much diagnostic value. But it must be remembered that this symptom is not peculiar to yellow fever. I have noted this lack of correlation of pulse and temperature in several cases of dengue. It is also not infrequently found in ordinary cases of jaundice. The slow pulse of yellow fever must be attributable to the special action of the poison upon the nervous system. The heart's action may be slowed by influences exerted directly or through the retrograde effects of the delay of blood-currents in the capillary distribution.

Albuminous urine is a symptom of much diagnostic importance.

A tendency to hemorrhage may be safely stated to exist in all cases of yellow fever. In the mildest cases hemorrhage may not actually take place unless the patients be non-gravid females within the ovulating limits of life. These patients seldom pass through yellow-fever attacks without sanguineous vaginal discharges. But even in the mildest cases yellow fever establishes the hemorrhagic diathesis to an extent sufficient to render the occurrence of hemorrhage an imminent event. This fact is shown first, by the congested and tumid gums, from which blood can be readily pressed, and also by the still more important circumstance that medical or hygienic mismanagement is so quickly and certainly followed by black vomit or by hemorrhages from other parts of the system. Capillary congestion is undoubtedly an important factor in the production of hemorrhages in yellow fever, since we cannot otherwise account for the liability to hemorrhage which is so general in this disease.

The yellow color of the skin and eyes during life, and of the tissues and serum of the cadaver, is probably due to the coincident influence of two causes: first, to the coloring matter of the red corpuscles diffused in the serum of the blood; second, to an accumulation of secondary blood-poisons. The occurrence of the yellow color and its intensity bear a direct relation to the sluggishness of capillary circulation during the paroxysm. It appears likely, therefore, that the yellowness is principally ascribable to coloring principles derived from dissolution of the blood, to which capillary obstruction would so strongly predispose this fluid.

Schmidt has made a very careful résumé of the pathological changes found after death from yellow fever. The most important and uniform of these affected the nervous system, liver, and kidneys. They consisted for the most part of hyperæmic conditions, not infrequently attended by points of extravasation and of degenerative changes. The latter are principally found in the liver, and bear some relation to the duration of the case, and it may be also to the degree and persistence of the pyrexia. When the liver is the seat of fatty degeneration, it is yellowish in color in whole or in parts. It is then sometimes spoken of as the café au lait or the box-wood liver.

In cases which run a very rapid course these changes are not observed, but only those which indicate congestion are found, and often hemorrhagic puncta. In these instances the depending portions of the body have dark or livid ecchymoses.

TREATMENT.—There are two propositions to which due attention should be given before formulating rules for the treatment of yellow fever. The first of these is, that yellow fever is strictly a self-limited disease, and therefore is insusceptible of jugulation. Both clauses of this proposition are indisputably true. Cases have been observed in which mitigation of symptoms and abridgment in duration appeared to follow spontaneous diarrhoea. Such events must be extremely uncommon, since in my large experience I know of but one such instance supported by good testimony.

Efforts to abort the disease by purgatives, bleedings, cold baths, quinia, etc. have all signally failed. Among the possibilities of the future is the discovery that some drug or combination of drugs is capable of meeting yellow-fever poison in the field of the circulation and antagonizing it sufficiently to rescue the victim from its fatal toxic effects.

The second proposition is, that the formative stages of the disease—that is, the early hours of the paroxysm—afford the most precious moments for instituting such medication as may be considered proper. This proposition applies no doubt to a number of other acute affections, but in no one among them all is it so important to be regarded as in yellow fever. The primary effects of the poison are so boldly outlined that it appears highly probable that the damage it exerts upon the economy is chiefly inflicted during the paroxysm. This affords an additional reason why efforts at medication should be principally restricted to the paroxysm and to the earliest periods of that stage.

It is probable that during an attack of yellow fever the patient's hold upon life is more or less secure in direct ratio to the number of functions which retain their physiological integrity fairly well. The suggestion of such a fact should exclude all scholastic or routine rules of treatment.

In simple forms of yellow fever the first desideratum of the practitioner is to become acquainted with the patient's condition at the moment of attack. If this has occurred after eating indigestible food or after a hearty meal of any description, the stomach should be emptied. Ipecacuanha may be given in warm water or chamomile infusion until this result has been accomplished. After emesis, provided this should have been considered necessary or as a first step of treatment under other circumstances, a purgative is usually given. The benefits of purgation are, in my opinion, limited to the act of ridding the bowels of any fecal accumulations present. For this purpose those purgatives which combine a due degree of efficiency with inoffensiveness in operation have appeared to me to be the best. Castor oil is at the head of this class. An ounce may be given to an adult in some acceptable vehicle. This may be followed by an enema of tepid water when required. Salines are more agreeable to the palate, but far too unmanageable in their cathartic effects to be adopted generally.

Some very good practitioners believe that a mercurial purge at the onset of the attack impresses the subsequent career of the case in some favorable manner. I do not share in this opinion, but I do select calomel as the preliminary purgative in cases where much gastric irritability attends the early periods of the attack. I exhibit it also in those cases in which previous indisposition had occasioned coating of the tongue, or in which other conditions of systemic derangement existed for which calomel is usually prescribed.

In many cases it is desirable to avoid the disgust at taking a purgative or the perturbation it may occasion by its action. Enemas of tepid infusion of linseed or of milk and water may be substituted, with the addition of castor oil when necessary.

In the early hours of the attack warm pediluvia are always grateful and proper. They are to be given by placing a basin of warm water near the foot of the bed, beneath the covering of a light blanket or sheet, and allowing the patient's feet to remain immersed for ten or fifteen minutes. If the feet are cold, mustard should be added. During the foot-bath the patient usually falls into a perspiration which is sometimes profuse and general.

Perspiration is a desirable event during the paroxysm, although it is not, like the sweatings of the malarial fevers, critical, in the sense of being accompanied by a marked decline in temperature. The idea that sweating is beneficial is so strongly and generally prevalent as to give countenance to the erroneous practice of resting the cure of the disease upon its production and maintenance. I have seen valuable lives sacrificed by obstinate persistence in measures to promote diaphoresis, more especially in the later hours of the paroxysm or in the succeeding or calm stage. It is quite sufficient to encourage the perspiration by the pediluvia and by a moderate allowance of cool, palatable drinks. Much value is attached by non-professional persons to a warm infusion of orange-leaves or some other warm and grateful beverage. When agreeable to patients I permit them in moderate amounts, but do not regard them as especially valuable.

Jaborandi has been used in yellow fever. Strong hopes were quite naturally based upon the action of this drug in exciting excretory functions, especially diaphoresis, but the observations of my friend Dr. Thomas Layton and of others show that it possesses no special value, while it frequently increases the vomiting and has to be discontinued.

After the bowels have been relieved of fecal accumulations it is good practice to exhibit a scruple of quinia in solution with ten to thirty drops of tincture of opium, by rectal injection. Infusion of linseed or mucilage of elm-bark or gum-arabic are the best vehicles.

The combined action of the quinia and opium mitigates the patient's headache and lumbar pains. But the influence of these drugs is not limited to their effect on the nerves of sensation. In quite a proportion of cases reaction is not so prompt or complete as usual; or reaction may be quite pronounced, and still the surface may alternate between a dry and a perspiring state. These oscillations of function of the organic nerves are also often corrected by this prescription. In the great majority of simple cases no other medication than this is requisite or proper, for no medication is proper in yellow fever unless it is requisite.

When the neuralgias are excessively violent, opium may be again administered, preferably by enema, and in combination with bromide of potassium or chloral hydrate. But the effects of opium in limiting excretory function must always be borne in mind and carefully avoided.

External applications are very efficacious in relieving the neuralgias. In the southern part of this country the "eau sedative" of Raspail is greatly used. This is a mixture of ammonia, camphor, and common salt in solution, and may be prepared extemporaneously. The applications may be made hot or cold, but if used cold they must be continuously kept up. It is therefore better to use them warm if sufficiently effective. Stimulating embrocations of turpentine or mustard, or dry or wet cups, are sometimes resorted to for relief of pain.

Excessive temperature demands attention and antagonistic treatment in direct measure with its persistence, its degree, and its occurrence in advanced periods of an attack.

In the epidemic of 1867, I used gelsemium as an antipyretic in fifty cases or more, but the results were so unsatisfactory that I have quite abandoned its exhibition. I have given quinia as an antipyretic, but never in doses of more than a scruple. In these doses it has failed to accomplish the desired result in the great majority of the cases. Perhaps its antipyretic effects are limited to those cases in which malaria is a known or an unknown complication.

I have exhibited small doses of digitalis with apparent benefit, but aconite and veratrum viride I have long since discarded. The physician cannot afford to sacrifice gastric quietude and competency of function to the use of remedies whose value as antipyretics is, to say the most, quite doubtful.

Cold has for a long period of time been brought into use as an antipyretic in yellow fever. Its positive value and instantaneous action should be constantly borne in mind, and in the hyperpyrexia of yellow fever it constitutes by far the most reliable remedy, though its mode of application must be carefully adapted to the degree of fever present and to the susceptibilities of the patient. Cold drinks in limited quantities, but frequently repeated; cold spongings of the surface, or the use of the cold pack, especially in very high degrees of body heat; large injections of cold water per rectum, which may be passed off and repeated once in two to four hours,—form safe and effective modes of treatment.

Hemorrhages are a constant source of anxiety in yellow fever. It is very true that persons do not often die from actual loss of blood. I do not know that I have ever witnessed such an event except when the blood was poured out from a recently-emptied uterus. But the chances of recovery are lessened, because the hemorrhagic state indicates a degree of spoliation of both the fluids and solids of the system incompatible with maintenance of life. When this condition of constitution is once established, the stomach rarely escapes, and in a majority of instances it is the first, and sometimes the only, bleeding surface. The treatment should be directed, first, to the great indication of correcting the hemorrhagic diathesis; secondly, to quiet gastric irritability, in order that vomiting shall not cause rupture of capillaries. To meet the first indication I regard nutrition and stimulants as the most important measures of treatment. The mode of administration will be specially referred to under the head of alimentation.

Hæmostatic remedies, given as specific treatment, generally fail in accomplishing the purpose for which they are administered. It has always appeared to me that those therapeutic agents which are capable of controlling hemorrhage where yellow fever is not present are completely neutralized by the effects of its toxic agent upon the vaso-motor nerves. Consequently, while ergot, turpentine, gallic acid, and other like remedies may be resorted to, too much hope should not be entertained as to their good effects.

Some excellent practitioners rely greatly on preparations of iron. The tincture of the chloride is undoubtedly the best. This may be given in water or upon shaved ice in doses of five or ten drops every half hour. To allay the gastric irritability pellets of ice should be swallowed. Effervescing drinks may be given with benefit.

I have often used with good results the following prescription:

Rx.Sodii Bicarb.gr. xx;
Morphiæ Sulph.gr. ss.
Aquæ Lauro-Cerasi,
Aquæ Menth. Pip. aa.fl. drachm iv. M.

S. Teaspoonful after every act of emesis.

Occasionally I have given the following prescription:

Rx.Creasotigtt. viij;
Tinct. Opii Deodorat.gtt. xl.
Aquæ Menth. Pip.,
Muc. Acaciæ aa.fl. drachm iv. M.

S. Teaspoonful after every act of emesis in iced Seltzer or Apollinaris water, or in champagne.

Sometimes a few drops of chloroform in a spoonful of iced mucilage of acacia act favorably.

In cases which appear utterly hopeless the physician, acting desperately, is sometimes able to save life by treatment which could scarcely be safely recommended. I once administered a fourth of a grain of morphia to a child of seven years, who, after a sleep of ten hours, ceased to throw up black vomit and recovered.

External applications to the epigastrium usually afford some relief to nausea at any stage of yellow fever. Mustard or aromatic cataplasms may at all times be used with hopes of favorable effects. Towels wrung from cold water are very efficacious. Sometimes a drachm or two of chloroform dashed over them increases their anti-emetic action.

Suppression of urine is generally a symptom of fatal import. Attempts may be made to establish the secretion by dry or wet cups in the lumbar region, by warm applications around the loins, or by mustard cataplasms or blisters. If the condition of the patient's stomach is such as to permit this practice, copious diluent drinks and diuretics should be given. Lemonade holding bitartrate of potassium in solution is generally the most acceptable, and probably the most efficient. Some physicians think they oftener obtain good results from small and frequently repeated doses of turpentine. I can bear testimony to the good results which sometimes follow large rectal injections of warm or cold water, the latter being preferable when there is high fever.

In certain cases of yellow fever reaction from the cold stage is feeble and imperfect, or perhaps may not occur at all. This departure from type is very fatal. The patients are stupid, sometimes semi-comatose and incoherent, from the earliest hours of the attack. The face is listless, drunken, or idiotic in expression. The color of the skin is dark olive and almost livid. The print of a hand on the chest is very slowly effaced. Sometimes the surface is covered with a peculiarly unctuous perspiration. The pulse is feeble and compressible; the temperature seldom more than one or two degrees above the normal standard. Albuminous urine is found during the first day. Death, attended by convulsive rigors, generally closes the scene within seventy-two hours from the moment of seizure.

Hot mustard-baths should be resorted to. Blood may be drawn by cups or leeches from the back of the neck or temples, and this may be followed by the application of a blister. Morphia and atropia may be exhibited subcutaneously in small doses, to be repeated as often as proper. Quinia may be administered per rectum or by the hypodermic method. Lastly, pilocarpine may be thrown into the tissues in sufficient doses to procure its vigorous physiological action.

Almost in precise symptomatic contrast with these cases of failure in reaction is another form of attack, in which violent disturbances of nerve-function occurs; such cases often being characterized as congestive in type. The most typical of these attacks are among children or adolescents. If attended by noticeable chill, it is ordinarily slight. Reaction is quick and excessively violent. The face is flushed, the eyes injected, and convulsions with delirium are liable to occur as early symptoms. I have watched with much interest the alternate flushings and pallor of the countenance occurring in these cases, such as are often observed in basilar meningitis.

The treatment in this type of attacks should include chloroform by inhalation in sufficient amount to control convulsions. Chloral hydrate may be administered by enema, or morphia hypodermically. Cathartic doses of calomel often exert a beneficial effect. Leeches or cups, to be followed by cold applications or by blisters, may be applied about the head or neck. But cupping and leeching should only be resorted to in the treatment of grave symptoms, since obstinate hemorrhage is liable to occur from any and every point from which the cuticle has been removed.

Yellow fever is often masked during the paroxysm by some pre-existing disease. Malarial fevers, the febrile states of pulmonary consumption or of the recently-delivered female, may all mask the early clinical phenomena to such a degree that the most experienced and vigilant practitioners are sometimes astonished to find black vomit, suppression of urine, and all those symptoms which mark the last stages of the disease, suddenly developed.

Walking cases should be classed in the same category as masked forms. In these instances the early symptoms are so slight as to be overlooked or neglected by their subjects. They continue to prosecute their usual pursuits until, by sheer exhaustion, they are driven to beds from which they seldom arise.

The hygienic and dietetic management of yellow-fever patients is extremely important, and the strictest attention must be paid to the condition and discipline of the sick chamber. In this disease those occurrences and circumstances which in other affections would be reckoned as unimportant and trivial become matters of serious magnitude.

The physician, by a composed and cheerful demeanor, often decides which end of the balance shall go down. But an intelligent, experienced, and faithful nurse is equally as important as the excellent physician.

The patient should be confined in strictly recumbent positions, and all drinks and foods must be given through tubes or from pap-cups. It frequently occurs that patients are unable to void the bladder in such positions. In these cases the catheter should be used, rather than suffer any violation of the rule which demands a maintenance of unbroken decubitus.

The sick room should be kept freely ventilated, and the patient's bedding should be changed, when requisite, by removing him to one side of the bed while the other is renovated. If the patient's night-shirt becomes soiled and disagreeable, it may be cut so as to remove it, and another, cut in the same manner, may be substituted and stitched together. The room must be kept quiet, and useless visiting entirely forbidden.

Cool and grateful drinks may be given in any stage or state of yellow fever if demanded by patients. The quantity allowed at one time should be small, since over-distension of the stomach almost certainly causes vomiting. Effervescing drinks are nearly always grateful, and are better tolerated than others. Seltzer-water and lemonade, or Seltzer or Apollinaris on shaved ice, are to be recommended. Sometimes patients call for sparkling wines or beers. I never refuse them or any other alcoholic drink asked for in any stage of the disease. Wine surely possesses valuable therapeutic effects in yellow fever.

Alimentation must be severely controlled by the physician, and the tolerance and effects constantly watched. Even to the most experienced physician the kind of food to be selected, and the time and manner of administration, constitute difficult problems. In simple forms of the disease food had better be strictly withheld during the continuance of the paroxysm. Even after the stage of calm has been reached, sufficient time should be allowed to elapse to enable the physician to form some estimate of the degree of damage his patient has suffered and his competency to retain foods and be nourished by them. This question can seldom be answered in a decided manner, except through a cautious trial of some bland and inoffensive food.

On the third or fourth day of sickness a single tablespoonful of iced milk may be given, and the immediate consequences closely watched. If no retching or gastric uneasiness should ensue, it may be repeated at the end of thirty minutes. Some physicians prefer to begin with spoonful doses of equal parts of sweet milk and thin barley-water. In my own experience chicken-water has proved to be the most universally acceptable, as well as the most beneficial, of all the various forms of nutriment to be chosen as a first venture. I have frequently combined this with barley-water when first given. In this cautious and tentative manner even the most experienced physician prefers to proceed, rather than to attempt to prescribe rules of diet in an abstract and arbitrary manner.

If these light articles of diet are well borne, they are to be gradually and watchfully exchanged for beef-essences, the blood of a rare beefsteak, and the more substantial broths. Solid articles of food should not be allowed during the first ten days after an attack, and for still longer periods patients should be admonished against excesses in eating, and especially in respect to indigestible articles. Those lesions of the blood and of the stomach, and those grave disorders of nerve-function which occasion hæmatemesis in yellow fever, are slowly repaired. Instances are reported in which black vomit and death have followed excessive eating and drinking ten or twenty days after dismissal from treatment.

There are, however, certain conditions which are liable to complicate yellow fever which demand a course of dietetic procedure different from that which I have recommended. Thus, children cannot bear privation of food until the paroxysm is over if its duration is long. In like manner, a more supporting course is required in most of those cases in which yellow fever occurs as an intercurrent affection, in all those cases which are termed typhoid or adynamic per se, and, more emphatically still, in every case in which hemorrhages are occurring. A failing pulse should in all instances admonish us to resort to nourishment and stimulants.

It is a fortunate circumstance that in yellow fever the lower bowel is generally in a state favorable for the retention of nutritious enemas. In the most trying and critical hours of desperate cases I have seen patients tided through by the use of skilfully prepared and skilfully administered injections of some suitable meat-essence. When insomnia exists, chloral hydrate or bromide of potassium may be conveniently given in these vehicles.

It is evident that the discussion of the vastly important sanitary questions pertaining to the prevention of yellow fever cannot be appropriately discussed in the present article.