In conclusion, the fact should be emphasized that there are cases of smallpox of so mild a character, with general symptoms so slight and eruption so sparse and ill-defined, as to make a positive diagnosis extremely difficult. It is a good plan to employ vaccination in such cases as a test. Within three or four days the experienced observer will be able to determine whether the vaccination is successful or not; a negative result will of course have but a moderate value, but a positive result will serve to definitely exclude the diagnosis of smallpox. In all cases of doubt, whether before or after the eruption has appeared, the physician owes it to himself not less than to the patient and the community to frankly explain to the patient or his family the difficulty in arriving at a diagnosis, and to express his suspicions that the case may be one of smallpox. It need hardly be said that such a case should be as strictly isolated as if the diagnosis of smallpox were already established. CHAPTER III. TREATMENT. In the treatment of smallpox the therapeutic measures employed must necessarily vary with the severity of the disease and the condition of the patient in its successive stages. No remedy or plan of treatment will apply to all cases and at all times. As in the other exanthemata, there are cases of variola in which the disease runs so mild a course that a little nursing or simple attention to the personal comfort of the patient is all that is absolutely necessary. Such cases occur in those who have already had the disease,--for a second attack of smallpox must always be considered as a possibility, although it is a more rare occurrence than some writers would lead us to believe. Such cases also occur and with the greatest frequency in those who have been rendered more or less immune by a previous vaccination. But mild cases of smallpox may also occur among the unvaccinated; and in the present epidemic I have noted a few cases where, in spite of the lack of any protection from vaccination, the eruption and other symptoms of the disease were quite as mild as in some cases of so-called varioloid, or smallpox modified by previous vaccination. In contrast with these cases which require no special medical treatment, there are others of marked severity with unexpected complications which tax the physician’s skill to its utmost capacity. Still another class of cases, fortunately rare in most epidemics, are those to which the name of variola maligna has been given, and in which medical treatment seems to be almost as unnecessary as in the mild cases, since all attempts to avert a fatal termination have so far proved utterly futile.