_Head._ Arachnoid thickened and opake; effusion of gelatinous fluid beneath it; substance of brain highly vascular; in the inferior cornu of left ventricle a pint of purulent matter, somewhat resembling broken down cortical substance; it lay loose within the cavity. _Thorax._ Superior lobe of right lung gorged and partly hepatized. [Pleuræ of right side adherent;] _Abdomen._ Mucous membrane of cæcum and commencement of colon vascular. CASE XXXI. HENRY BREWER, æt. 59, labourer. Admitted on the 10th day of fever: states that he has no pain in the head, and that he is quite free from pain every where excepting in the right side, where he has some uneasiness, which is attended with slight cough; tongue brown and dry; bowels natural; pulse 96. 12th. No pain of head; that of chest gone; sleeps well; pulse 108. 16th. About an hour after yesterday’s visit became suddenly insensible; it has been impossible to rouse him from this coma which still continues profound; respiration stertorous. Died in the course of the day. _Head_: Dura mater thickened but not vascular; arachnoid thickened and opake; beneath it gelatinous effusion; upon its external surface a large quantity of well-formed pus; a quantity of purulent matter at the base of the brain surrounding the corpora quadrigemina: walls of the fourth ventricle ragged; two ounces of serous fluid in lateral ventricles and at base. _Thorax._ [Pluræ adherent; lower and middle lobes of right lung hepatized.] _Abdomen._ Viscera healthy. 3. _Vascularity of Brain, Membranes, &c. with copious Serous Effusion._ CASE XXXII. GEORGE BLACKBEARD, æt. 18, servant. Admitted on the 22nd day of fever: complaint commenced with violent head-ache attended with frequent fits of epistaxis; pain of the head still continues, chiefly confined to the occiput; little sleep; eyes injected and suffused; pulse 102, tongue loaded, dry. 23d. Scarcely any pain in the head. 25th. Pain of the head entirely gone; epistaxis. 26th. Delirium: muscular tremor. 28th. Delirium and muscular tremor increased; pulse 112; tongue more dry; lips and teeth sordid. 31st. Died. _Head._ Membranes and substance of brain vascular; ventricles distended with serum; no characteristic disease in thorax or abdomen. CASE XXXIII. ANN HIGGINS, æt. 30, servant. Admitted on the 22d day of fever: pain of head from the commencement very severe; chiefly confined to the right side; still continues, together with severe pain in the limbs; some pain in the right side of chest; cough; abdomen not tender; tongue dry in middle; red and moist around edges and at point; pulse 105, feeble; much prostration; entire surface of the body preternaturally sensible. 23rd. The sensibility which from the commencement has been felt over the whole surface of the body is now particularly acute in the joints; in all of which there is severe pain; pulse 112.