Chicken-Pox is an ailment of such slight importance that it would scarcely call for notice if it were not that the resemblance of the eruption to that of small-pox sometimes leads to its being mistaken for that disease.

It is highly contagious, and for this reason perhaps it is usually met with in infancy and early childhood. Sometimes, though by no means constantly, the eruption is preceded for twenty-four or thirty-six hours by slight feverishness; but oftener the appearance of the rash is the first indication of anything being the matter. It shows itself in the form of small pimples, which in a few hours change into small circular pocks containing a little slightly turbid fluid. They appear on the forehead, face, and body, but very rarely on the limbs; they enlarge for some two or at most three days, then shrivel and dry up; and at the end of a week the crusts or scabs fall off, scarcely ever causing any permanent pitting of the skin. They are usually not above twenty or thirty in number, though every now and then they are much more numerous without any obvious reason. Their distinction from the small-pox eruption consists not only in the smaller size of the pocks, and in the entirely different course which they run, but also in the fact that two or three successive crops of the eruption appear in the course of five or six days, so that new ones, those at maturity, and those on which the crusts have already formed, or from which they have already fallen, may be seen on the child at the same time. This is sufficient of itself to establish the difference between the two diseases, and also to distinguish between chicken-pox and the milder variety of small-pox which is sometimes observed in children who have been already vaccinated.

Measles is a disease with which almost everyone is familiar, and one which with proper care is not generally attended with danger. Its great risks are twofold; first, that of its being complicated with bronchitis, or inflammation of the lungs during its progress, and next of its being followed by an imperfect recovery, and by the awakening into activity any tendency to scrofulous or consumptive disease. On these two accounts the disease is not to be made light of, and special watchfulness is to be exercised during the whole time of convalescence. It is also unwise when one child in a family is attacked by measles to expose the others, as is often done, to its contagion, in order, as people say, 'to get it over;' for its mildness in one case furnishes no guarantee of its mildness in another, and the danger of the disease is almost in exact proportion to the tender age of those who are attacked by it.

The early symptoms of measles are those of a bad feverish cold; the eyes grow red, weak, and watery, and are unable to bear the light, the child sneezes very frequently, sometimes almost every five minutes, and is troubled by a constant short dry cough. About the fourth day, a rash makes its appearance on the face, forehead, and behind the ears, and in the course of the next forty-eight hours travels downwards over the body and limbs, and then in another forty-eight hours it fades in the same way, being at its height on the body when it has already begun to disappear from the face. It first shows itself in the form of small red circular spots, not unlike fleabites, but very slightly raised above the somewhat reddened skin, and looking for a few hours not unlike the very early stages of small-pox, before the eruption has lost the character of minute pimples. On the face the spots sometimes run together, and then form irregular blotches about a third of an inch long by half that breadth; while elsewhere they present an irregular crescentic arrangement. As the rash fades it puts on a dirty yellowish red appearance; the surface of the skin often becomes slightly scurfy, and it continues somewhat stained of a reddish hue for some days after the eruption has disappeared.

The only other point on which it is necessary to dwell is this, that the symptoms do not, as in small-pox, become less severe immediately on the appearance of the eruption, but continue just as troublesome as before for twenty-four hours or more, the voice being hoarse, the cough even more incessant, and the throat often slightly sore and red. Soon, however, improvement becomes apparent, the fever lessens, the cough grows looser; and in less than a fortnight the patient is usually convalescent.

The above is pretty nearly the ordinary course of measles, for we do not meet with that extreme variation in its severity which is observed in scarlatina, where one child will seem scarcely to ail at all, while its brother or sister may be in a state of extreme peril. It is not wise, however, to trust a case even of apparently mild measles to domestic management, for while the cough is troublesome in almost every case, the ear of the experienced doctor is needed to ascertain whether it is merely the cough of irritation which attends the measles, or the graver cough due to bronchitis.

One other caution will not be out of place. The danger of exposure to cold is very real, but that does not necessitate the loading the child with excessive covering, or the abstaining from washing its hands and face. The child should be kept moderately cool; and sponging its hands and face frequently with tepid water soothes it and relieves the painful irritation and itching.

German Measles.—There is a disorder which seems to hold a middle place between measles and scarlatina, akin to both, identical with neither, and furnishing no sort of protection from their occurrence.

It is known in this country by the name of German measles, or sometimes by its German name of Rötheln; the first clear description of its character having been given by German writers.

It is unfortunate that a very slight resemblance of some of its symptoms to those of scarlet fever has led to its being sometimes mistaken for it, and as the ailment is almost always very trivial, doctors anxious to avoid alarming their patients' friends, too often allow the error to go unrectified, and the disease to pass as one of mild scarlet fever.