Definition.--This is a slightly contagious disease of children, characterized by an eruption of vesicles on the surface of the body. Children may get off with a dozen pox, and sometimes the disease is so severe that they have one hundred and fifty to two hundred on the entire body As a rule, it is a very insignificant disease. By that I mean that it is not of sufficient importance to worry about.

Etiology.--The disease occurs in epidemic, endemic, and sporadic forms; that is to say, it may spread all over the country, it may be confined to just one locality, and then again a case may occur in a community without any other cases developing. This is true of all so-called contagious diseases, showing that contagion requires a proper physical state of the one taking the disease before it will manifest itself. No one will take any of the so-called epidemic or contagious diseases who is not in a favorable condition to be stricken down.

Symptoms.--It is said that after exposure it requires from ten to fifteen days for the disease to develop. In some cases it starts with a slight chill. Most children are a little irritable and cross--just as they might be with indigestion; and, indeed, they have indigestion, or they would not take the disease. The question, therefore, is: Is it the indigestion that causes the disease, or causes the chicken-pox, or does the chicken-pox cause the indigestion? The epidemic influence exists for certain diseases, but it must find the constitutional derangement exactly fitted before chicken-pox, or any other specific disease, can manifest. All such diseases represent a peculiar chemical state of the fluids of the body. Then, when the proper domestic or civic influence is created, the combination ends in a certain type of disease. This is true of all so-called contagious diseases. This definition may be used for diphtheria, scarlet fever, smallpox, etc. Nothing will come of chicken-pox per se. Children who are abused very greatly and have deranged digestions, and who possibly are predisposed to tuberculosis, may break down from an attack of chicken-pox; but it is a mistake to recognize chicken-pox as the cause. It only marks the beginning of the breaking-down, because the constitutional derangement was in existence before the chicken-pox developed.