We shall not here attempt to give a scientific and elaborate classification of the affections to which the term fevers is attached. Fevers in which the high temperature is continuous from the outset without any very great remission or interruption, are termed continued fevers. To this class belong febricula, typhoid, and typhus fevers, erysipelas and relapsing fever. Periodical fevers are those in which the disease is subject to regular periodical intermissions or remissions. Intermittent, remittent, typho-malaria, yellow fever, and a fever to which the term dengue is applied, belong to this class. Fevers in which the nervous system is very greatly dis turbed are said to be ataxic. Those which are very fatal are called malignant. Putrid fevers are those in which there is supposed to be tendency to putrefactive changes in the fluids of the body. The terms gastric and mucous fevers are sometimes applied to fevers in which the stomach and intestinal canal are particularly affected. The terms high and low as applied to fevers relate to the degree of temperature. A slow fever is one in which the intensity of the fever is not great but the duration prolonged. Congestive fevers are those in which there is supposed to be a marked tendency to congestion of the internal organs.