CHICKEN-POX, OR GLASS-POX; AND COW-POX, OR VACCINATION.

2538. CHICKEN-POX, or GLASS-POX, may, in strict propriety, be classed as a mild variety of small-pox, presenting all the mitigated symptoms of that formidable disease. Among many physicians it is, indeed, classed as small-pox, and not a separate disease; but as this is not the place to discuss such questions, and as we profess to give only facts, the result of our own practical experience, we shall treat this affection of glass-pox or chicken-pox, as we ourselves have found it, as a distinct and separate disease.

2539. Chicken-pox is marked by all the febrile symptoms presented by small-pox, with this difference, that, in the case of chicken-pox, each symptom is particularly slight. The heat of body is much less acute, and the principal symptoms are difficulty of breathing, headache, coated tongue, and nausea, which sometimes amounts to vomiting. After a term of general irritability, heat, and restlessness, about the fourth day, or between the third and fourth, an eruption makes its appearance over the face, neck, and body, in its first two stages closely resembling small-pox, with this especial difference, that whereas the pustules in small-pox have flat and depressed centres—an infallible characteristic of small-pox—the pustules in chicken-pox remain globular, while the fluid in them changes from a transparent white to a straw-coloured liquid, which begins to exude and disappear about the eighth or ninth day, and, in mild cases, by the twelfth desquamates, or peels off entirely.

2540. There can be no doubt that chicken-pox, like small-pox, is contagious, and under certain states of the atmosphere becomes endemic. Parents should, therefore, avoid exposing young children to the danger of infection by taking them where it is known to exist, as chicken-pox, in weakly constitutions, or in very young children, may superinduce small-pox, the one disease either running concurrently with the other, or discovering itself as the other declines. This, of course, is a condition that renders the case very hazardous, as the child has to struggle against two diseases at once, or before it has recruited strength from the attack of the first.

2541. Treatment.—In all ordinary cases of chicken-pox—and it is very seldom it assumes any complexity—the whole treatment resolves itself into the use of the warm bath, and a course of gentle aperients. The bath should be used when the oppression of the lungs renders the breathing difficult, or the heat and dryness of the skin, with the undeveloped rash beneath the surface, shows the necessity for its use.

2542. As the pustules in chicken-pox very rarely run to the state of suppuration, as in the other disease, there is no fear of pitting or disfigurement, except in very severe forms, which, however, happen so seldom as not to merit apprehension. When the eruption subsides, however, the face may be washed with elder-flower water, and the routine followed which is prescribed in the convalescent state of small-pox.

2543. COW-POX, properly speaking, is an artificial disease, established in a healthy body as a prophylactic, or preventive agent, against the more serious attack of small-pox, and is merely that chain of slight febrile symptoms and local irritation, consequent on the specific action of the lymph of the vaccination, in its action on the circulating system of the body. This is not the place to speak of the benefits conferred on mankind by the discovery of vaccination, not only as the preserver of the human features from a most loathsome disfigurement, but as a sanitary agent in the prolongation of life.

2544. Fortunately the State has now made it imperative on all parents to have their children vaccinated before, or by the end of, the twelfth week; thus doing away, as far as possible, with the danger to public health proceeding from the ignorance or prejudice of those parents whose want of information on the subject makes them object to the employment of this specific preventive; for though vaccination has been proved not to be always an infallible guard against small-pox, the attack is always much lighter, should it occur, and is seldom, if indeed ever, fatal after the precaution of vaccination. The best time to vaccinate a child is after the sixth and before the twelfth week, if it is in perfect health, but still earlier if small-pox is prevalent, and any danger exists of the infant taking the disease. It is customary, and always advisable, to give the child a mild aperient powder one or two days before inserting the lymph in the arm; and should measles, scarlet fever, or any other disease arise during the progress of the pustule, the child, when recovered, should be re-vaccinated, and the lymph taken from its arm on no account used for vaccinating purposes.

2545. The disease of cow-pox generally takes twenty days to complete its course; in other words, the maturity and declension of the pustule takes that time to fulfil its several changes. The mode of vaccination is either to insert the matter, or lymph, taken from a healthy child, under the cuticle in several places on both arms, or, which is still better, to make three slight scratches, or abrasions, with a lancet on one arm in this manner, ,,",, and work into the irritated parts the lymph, allowing the arm to dry thoroughly before putting down the infant's sleeve; by this means absorption is insured, and the unnecessary pain of several pustules on both arms avoided. No apparent change is observable by the eye for several days; indeed, not till the fourth, in many cases, is there any evidence of a vesicle; about the fifth day, however, a pink areola, or circle, is observed round one or all of the places, surrounding a small pearly vesicle or bladder. This goes on deepening in hue till the seventh or eighth day, when the vesicle is about an inch in diameter, with a depressed centre; on the ninth the edges are elevated, and the surrounding part hard and inflamed. The disease is now at its height, and the pustule should be opened, if not for the purpose of vaccinating other children, to allow the escape of the lymph, and subdue the inflammatory action. After the twelfth day the centre is covered by a brown scab, and the colour of the swelling becomes darker, gradually declining in hardness and colour till the twentieth, when the scab falls, off, leaving a small pit, or cicatrix, to mark the seat of the disease, and for life prove a certificate of successful vaccination.

2546. In some children the inflammation and swelling of the arm is excessive, and extremely painful, and the fever, about the ninth or tenth day, very high; the pustule, therefore, at that time, should sometimes be opened, the arm fomented every two hours with a warm bread poultice, and an aperient powder given to the infant.