It is a vulgar error to suppose that epidemics are occasioned by the spread of disease, from person to person, by infection or contagion; for it is an ascertained fact that, before any people is attacked epidemically, the disease attacks individuals in a milder form, one at a time, at distant intervals, for weeks or months before the epidemic appears. Before an epidemic of cholera, these cases consist generally of diarrhœa of more or less intensity, followed by a rapidly fatal case or two, very much resembling cholera. Even plague itself, as in the recent epidemic at Bengazi, begins with cases which cannot be distinguished from ordinary typhus-fever, the succeeding cases getting more and more intense, until the epidemic seizure takes place. Experience appears to show that without this antecedent preparatory stage, affecting more or less the entire population of a town or district, the occurrence of an epidemic is impossible--the epidemic being, in fact, the last or, so to speak, the retributive stage of a succession of antecedent phenomena extending over months or years, and all traceable to the culpable neglect of natural laws. It is simply worse than folly, after the penalty has been incurred, to cry out “contagion,” and call for the establishment of sanitary cordons and quarantine, instead of relying on measures of hygiène. Epidemics are lessons to be profited by: they teach, not that “current contagions” are “inevitable” but that, unless nature’s laws be studied and obeyed, she will infallibly step in and vindicate them, sooner or later. In the words of the Registrar-General, which are as applicable to Armies as to States, “Sanitary measures and not quarantines are the real safe-guards of nations.” NOTE. I have just seen a paper by Sir John Hall, entitled “Observations on the Difficulties experienced by the Medical Department of the Army during the late War in Turkey.” In this somewhat singular document, which appears to be a defence of Sir John Hall’s own conduct, there are certain statements made about the female nursing establishment in the East which require a word of comment. It will be observed that throughout the paper, the weapon which Sir John Hall uses against all civil interference in repairing the sufferings which proceeded from the defects of his own department is simply detraction. As for Civil Commissions, they were useless, as for Civil Hospitals, they were costly, and their officers lived magnificently and were extravagantly paid. As for the nurses, they were benevolent, pious, well-intentioned persons, but what could they do? How could one woman nurse eighty sick? The medical men thought they could not. Why had Miss Nightingale stores of port wine placed at her disposal, which she could give to the French Hospitals, while he, the principal Medical Officer of the Army, had no such stores at his disposal? Sir John Hall must have already discovered that this old weapon is no longer of use in defending his position.