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 writers, occasionally excites symptoms not unlike those produced by some narcotic poisons; and in a few instances its course has appeared to be equally short. It requires particular notice, because the appearances left in the dead body are sometimes apt to escape observation.

This disease in its well-marked form has been noticed by various authors from Morgagni downwards. But the first regular accounts of it were given in 1818 by Dr. Abercrombie, and in 1819 by M. Rostan of Paris, and Professor Lallemand of Montpellier. Its symptoms are allied to those of apoplexy and epilepsy. But the comatose state is generally preceded by delirium or imperfect palsy, and often by a febrile state of the circulation. Contraction of the voluntary muscles, once supposed to be a distinguishing sign of this disease, is neither essential nor peculiar to it. In the dead body it is recognized by the presence either of an abscess in the brain,—or more commonly of a nucleus of disorganized cerebral tissue surrounded by unnatural redness or softness,—or sometimes of a clot of blood surrounded by similar softening. Occasionally, when the disease kills in its early stage, nothing is found but redness of a part of the brain, and slight softening of the tissue, recognizable only by scraping it with the edge of the scalpel.

In the form in which it is commonly seen, and as described by Rostan and Lallemand from a great number of cases, it can hardly be confounded with the effects of narcotic poisons; for its course is much slower, being seldom less than several days when it proves fatal. Yet in some instances it may prove fatal instantly. Lancisi notices the case of an Italian nobleman, who after an apoplectic fit became liable to frequent attacks of lethargy,—who at length died quite suddenly more than a year afterwards,—and in whose brain an organized clot was found, with extensive suppuration of the brain around it. An unequivocal case of the same kind has been related by Mr. Dickson, a navy-surgeon. An elderly sailor, who for months before had done duty, eaten his rations, and drunk his grog as usual, suddenly dropped down while in the act of pulling his oar, and died at once; and after death there was found in the middle lobes of the brain an extensive abscess, which had made its way to the surface. Such cases might, in certain circumstances, be mistaken for the effects of large doses of hydrocyanic acid; but the morbid appearances are of course quite characteristic. M. Louis has related an instance like the last two, but where the disease was altogether latent. His patient after a long illness died of diseased heart, the ventricles of which communicated together. He never had a symptom of disorder of the head; yet on dissection an extensive recent