APPLICATIONS OF WATER.

The indications which are to be met in the treatment of disease are chiefly those enumerated below; and how admirably they are met by applications of water may be easily demonstrated by following the directions given.

1. Equalization of Circulation.—Disease cannot exist without some disturbance of the circulation. In perfect health each part receives its due share of blood. One of the first indications in disease, then, is to balance the circulation. If an organ contains too much blood, the application of cold water to the part will occasion contraction of the minute vessels of the part, and thus the amount of blood is lessened, as explained more at length in considering the physiological effects of water.

Or, the part may be relieved by the application of warm water in some form to adjacent or remote parts of the body, by which means the surplus blood will be drawn to other parts, thus relieving the suffering organ. Again, if an organ contains too little blood, the opposite course must be pursued. Warm or hot applications are made to the part, while cold applications may be made to other parts if necessary. Very often the two remedies may be advantageously combined, since one part cannot contain too much blood without some other part or parts being deprived of the due proportion, and vice versa; so that while a cold application is needed at one part, the opposite is required at another.

2. Regulation of Temperature.—As the condition of the bodily temperature is closely associated with that of the circulation, the two are usually controlled by the same remedies applied in the same manner. A part which contains too much blood has usually, also, too high a degree of heat. The cold application relieves both. If the entire surface of the body is involved, the application must be as extensive as necessary to affect the whole. In general fevers, the admirable adaptation of water to this end is well exhibited. When the temperature of the body rises above 100°, or even above 98°, a cooling bath should be resorted to. It may consist of a simple sponging with water, scarcely below the bodily temperature, an affusion with tepid water, a full bath of a tepid, temperate, or cold temperature, or some other form of cooling application according to the degree of cooling effect desired. Any temperature below 98° will be cooling. In general, it is better to employ a bath only a few degrees below the bodily temperature, as its application will not be followed by an increase of heat, called reaction, which follows a brief application of a cool bath. To obtain the proper cooling effects of a cool or cold bath, it must be continued for some time, from ten minutes to half an hour, at least. The same remark applies also to the application of cool baths for the purpose of equalizing the circulation.

3. Removal of Pain.—Pain is usually dependent upon disturbance of the circulation, being caused by the pressure of overfilled vessels upon the nerves in a confined space. Pain may be relieved by either hot or cold applications. The first object should be to remove the surplus blood, by local cold applications, and remote hot ones. If this plan is not successful, relief will be obtained by a hot local application, which operates by relaxing the surrounding tissues, so that the nerve fibers are relieved from pressure, as well as by quickening the local circulation, and so relieving congestion. The latter method is usually most quickly successful; but it is not so radically curative as the former. Pain dependent on passive congestion will be best relieved by the method next described.

4. To Excite Activity.—Many organs often become torpid or inactive, as the skin and liver, especially. Sometimes the blood-vessels of an organ become relaxed and inactive, passive congestion resulting. No remedy will so readily induce a return of activity to the affected parts as alternate hot and cold applications, continued for some minutes, fifteen to thirty or more. This is one of the best applications for the relief of old pains.

5. Removal of Obstructions.—A very large class of diseases are attributable to obstruction in various organs, caused by the reception of foreign matters into the system, and the accumulation of the natural waste of the tissues. The warm bath, to remove, external obstructions, and the internal use of water as a solvent for internal sources of obstruction, are the remedies which will achieve success in nearly all cases. Offending substances in the stomach are readily removed by the water emetic; and hardened accumulations in the large intestine are removed with equal facility by means of the enema.

6. Dilution of the Blood.—In fevers, cholera, and other diseases, the blood often becomes abnormally thickened, dark, and viscid, circulating with difficulty, and not imparting due nourishment to the tissues. Nothing but water can remedy this difficulty. It may be got into the blood by absorption from the skin, if the mucous membrane of the stomach will not absorb it.

7. Influence on the Nervous System.—Finally, it is often important to affect certain organs through their nervous centers. Water, properly applied, will accomplish this also. A fomentation applied to the abdomen will often remove headache, and is an excellent remedy for general nervousness, seeming to affect the whole system, just as does galvanic electricity when applied to the same locality, doubtless through the large nervous ganglia located in that region.

Some physicians claim to have obtained peculiar results by the application of heat or cold to the spine. It is said, for example, that cold applied to any portion of the spine will produce an increased circulation in the portion of the body supplied with organic nerves from the part. Hot applications to the spine are said to produce a contrary effect upon corresponding organs. Perhaps there should be still further observations upon this subject before any attempt is made to establish a definite law. It is well known that applications of ice to the spine is an excellent remedy for chorea, and several other nervous diseases.

For general nervous irritability, or nervousness, the warm full bath may be applied with uniform success. Neither hot nor cold applications are generally useful in such cases.

Temperature of Baths.—The thermometer is the only accurate measure of temperature; hence the importance of its use in the administration of baths. Yet the thermometer may be abused. A given temperature may seem warm to one individual and tepid or cool to another. The same difference of sensation will occur in the same individual on different occasions. What seems cool to-day will be thought warm to-morrow. The susceptibility of the body to sensations of heat and cold largely depends upon its condition and the temperature of surrounding objects. In consequence of this physiological fact, it is improper to attempt, as some have done, to fix certain exact temperatures at which baths must be given to all persons under all conditions.

For convenience and perspicuity, the temperatures of baths have been divided into six grades, as given in the following table by Forbes; all who attempt to use the bath according to the directions should carefully learn and preserve the distinctions here made:—

1. Cold Bath,33°to60°F.
2. Cool,60°„75°
3. Temperate,75°„85°
4. Tepid,85°„92°
5. Warm,92°„98°
6. Hot,98°„112°

The vapor bath ranges from 98° to 120°; the hot-air or Turkish bath from 100° to 160°, or even higher, though not usefully so.

A bath of any temperature above the natural heat of the body, 98°, is a hot bath. At 32°, water becomes ice; a bath is very rarely given at this temperature, and then the application should be made to only a small surface. Water at 32°, and even ice and snow, may be usefully employed as topical remedies in local diseases. It will rarely be necessary to employ a full bath at a lower temperature than 65°, which will usually seem very cold to the patient. A temperature from 85° to 95° is the most generally useful for baths which involve a considerable portion of the body, though of course higher temperatures are employed in local applications.

How to Determine the Temperature of a Bath without a Thermometer.—It is often necessary to administer a bath when a thermometer cannot be obtained. In such cases it is customary to test the temperature by placing the hand in the water. This is an unreliable method, however; for the hand becomes, by usage, so obtuse to heat that water which would seem only warm to it would be painfully hot to the body of the patient. To avoid this source of error, it is only necessary to plunge the arm to the elbow into the water, by which means its real temperature will be determined. Water which causes redness of the skin is hot; when it feels simply comfortable, with no special sensation of either heat or cold, it is warm. Slightly cooler than this, it is tepid. When it causes the appearance of goose-flesh, it may be for practical purposes called cool, a still lower degree being cold.

Another Method.—The method about to be described is somewhat more accurate than the preceding, and may be found convenient for facilitating the preparation of a bath of proper quantity as well as temperature, a matter which though simple enough is often quite annoying to inexperienced persons. It is a fact of common knowledge that water boils at 212° F. Boiling water, then, is always of this temperature. Well and spring water, and the water of cisterns in winter, does not vary greatly from 53°. The temperature of well and spring water changes very slightly with the seasons. By combining in proper quantities water of these known temperatures, any required temperature may be produced. Not having seen this method suggested before, we have prepared the following table, which may perhaps be used to advantage in the absence of a thermometer; we advise all to obtain and use a thermometer, however, when it is possible to do so:—

Tem. 53°. Tem. 212°.
2 qts. added to 1 qt. equals 3 qts. at 106°
2½ „ „ 1 „ „ 3½ „ 98°
3 „ „ 1 „ „ 4 „ 93°
4 „ „ 1 „ „ 5 „ 85°
5 „ „ 1 „ „ 6 „ 80°
6 „ „ 1 „ „ 7 „ 76°
8 „ „ 1 „ „ 9 „ 71°

When larger quantities are needed, it is only necessary to multiply each of the combining quantities by the same number. For instance, if a gallon and a half of water is needed for a foot bath at 106°, pour into a pail or bath-tub four quarts of fresh well water and then add two quarts of boiling water. If four gallons of water are wanted for a sitz bath at 93° (a very common temperature), pour into the bath-tub three gallons of fresh well or spring water, and add one gallon of boiling water. Thus any required quantity can be obtained at the temperatures given. The cold water should be placed in the vessel first, and there should be no delay in adding the hot water, as it would rapidly lose its heat, and thus make a larger quantity necessary. Determinate measurement is not essential. The cold and hot water may be added alternately in proper proportions, being measured by the same vessel until the requisite quantity is prepared.