. A practical treatise on medical diagnosis for students and physicians . varian cysts, and fetid discharges. They aresimilar to the crystals described under sputum. Hcematoidin crystals indicate a previous hemorrhage ; they are mostfrequent in suppurating hydatid cysts. (See Fig. 277.) Fatty needlesare found in old pus and gangrenous exudates. (See Fig. 278.) Triplephosphates are frequently seen in pus, and are of the same appearance asthe phosphates in the urine. The carbonates and phosphates are seen infetid pus. Chemical Examination of Pus. This does not yield any informa-tion of diagnosti
. A practical treatise on medical diagnosis for students and physicians . varian cysts, and fetid discharges. They aresimilar to the crystals described under sputum. Hcematoidin crystals indicate a previous hemorrhage ; they are mostfrequent in suppurating hydatid cysts. (See Fig. 277.) Fatty needlesare found in old pus and gangrenous exudates. (See Fig. 278.) Triplephosphates are frequently seen in pus, and are of the same appearance asthe phosphates in the urine. The carbonates and phosphates are seen infetid pus. Chemical Examination of Pus. This does not yield any informa-tion of diagnostic value. Serum-albumin, globulin, and peptone are detected by methods employedin the examination of urine. Fresh pus contains sugar. After beingboiled with an equal weight of sodium sulphate and filtered, the filtrateis examined by the reagents used in the examination of urine for also contains bile-pigments and biliary acids, cholesterin, and saltsof sodium, and the fatty acids in jaundice. Yon Jaksch has foundacetone in pleural exudates. Fig. 277. Fig. Rhombic crystals of hsemii Pus from putrid empyema. (Eye-piece(Charles.) III., obj. 8, A. Reichert.) Shrunken leu- cocytes. Fat-crystals. (Von Jaksch.) Seropurulent Exudates. They resemble purulent discharges, chem-ically and morphologically. They point to antecedent inflammation. Putrid Exudates. The exudates are brown or brownish green incolor. The odor is penetrating and offensive. They are usually alkalinein reaction. On microscopical examination old leucocytes and crystals offat, cholesterin, and bematoidin are seen; fission-fungi of various formsare also seen. (See Figs. 277 and 278.) Hemorrhagic Exudates. Hemorrhagic exudates contain red blood-corpuscles and haemoglobin in large amount, Fatty endothelial cells arefound. Quincke states that when the glycogen-reaction is shown, ^ ifthe fluid is from the pleura, carcinoma is probably present. A positivediagnosis depends upon the discovery of the epithelial c
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