This disease, like the Small-Pox, seems to depend on specific contagion, and seldom affects a person but once in his life. The eruption is often succeeded by chilliness, succeeded by flushings, pains in the head and back, thirst, restlessness, and a quick pulse; but at other times, none of these premonitory symptoms are observable. Pustules soon appear, and about the second or third day are filled with a watery fluid, which is never converted into yellow matter, as in the small-pox (to which it bears great affinity); and about the fifth day they usually dry away, and are formed into hard crusts or scabs. No danger attends chicken-pox, but often a good deal of suffering. The small-pox and chicken-pox differ: the eruption of the former is preceded by a fever of a certain duration, while that of the latter is either preceded by none, or by one of uncertain duration; also in the pustules and succeeding scabs appearing much earlier in the chicken-pox than in the small-pox; and in the fluid of the pustules never acquiring the thick purulent appearance, which it always does in distinct small-pox. Let the patient partake freely of water or cooling drinks, as thirst is always an attendant on the disease, and gentle laxatives should be occasionally given—a tea-spoonful of lenitive electuary, with a little milk of sulphur in it, is all that is generally required; but should febrile symptoms run high, it may be advisable to take two or three saline draughts during the day. The following is a recipe for an excellent saline, to be drunk while effervescing:—Twenty grains of carbonate of soda dissolved in a tumbler containing two table-spoonfuls of water; add two tea-spoonfuls of lump sugar rolled; then put a dessert-spoonful of lemon into a wine-glass (or fifteen grains of citric acid dissolved in one table-spoonful of water). Pour it into the tumbler, and drink it while the effervescence is taking place. The benefit of this draught cannot be too highly estimated where the stomach is deranged, and there is nausea and faintness, or in cases of fever and thirst. CROUP.