_Head._ Dura mater along the course of the longitudinal sinus very adherent to the arachnoid; arachnoid and pia mater white and opake; surface and substance of brain highly vascular; surface of cerebellum vascular; substance healthy; pituitary gland suppurating; more fluid than natural in the ventricles; an ounce at the base. _Thorax._ Mucous membrane of bronchi highly inflamed; bronchial tubes filled with mucus mixed with pus; [pleura costalis of right side vascular; slight effusion into right pleural cavity, and into parenchyma of right lung; lower lobe much inflamed; pleuræ of left side adherent; that covering left side of diaphragm much inflamed; substance of left lung partly inflamed, partly consolidated.] _Abdomen._ Mucous membrane of small intestines inflamed; in that of ilium numerous large, raised ulcers; [liver adherent by several unnatural connexions to diaphragm, spleen and transverse arch of colon, but its substance was healthy; appendix vermiformis likewise adherent to abdominal peritoneum;] head of pancreas enlarged; [internal inguinal glands much enlarged, and some of them impacted with calcareous matter;] other viscera healthy. CASE CIX. MR. W——, æt. 50. The progress of this case having been observed with great care from the commencement to the termination of the disease, and affording an excellent illustration of the insidious manner in which the mixed form of fever sometimes attacks, and of the silent but rapid progress it makes without exciting alarm, until, at last, symptoms the most formidable, and which, to those who are not acquainted with the nature of the malady, appear to be most sudden, supervene, it may be useful to give a detailed account of it. This gentleman had been out of health six months previously to the present attack of fever: he had been observed to be gradually losing flesh, and fading; yet he laboured under no complaint that could be ascertained, excepting that his appetite failed; that he could digest well no kind of food; that he was badly nourished and, therefore, weaker in body and less vigorous in mind than usual.