. A practical treatise on medical diagnosis for students and physicians . not be found, a true decisioncan sometimes be reached by examining for hsemin crystals by Teich-manns method. A portion of feces is dried and powdered, placed on aslide with a grain of common salt, and covered by a cover-slip. A fewdrops of glacial acetic acid are directed beneath the slip, the slide is heatedjust to boiling, and if blood has been present, reddish-brown rhombiccrystals of hsemin \vi\\ usually soon be found ; but, as stated, the test isnot wholly reliable. Leucocytes. Leucocytes are frequently seen in nor
. A practical treatise on medical diagnosis for students and physicians . not be found, a true decisioncan sometimes be reached by examining for hsemin crystals by Teich-manns method. A portion of feces is dried and powdered, placed on aslide with a grain of common salt, and covered by a cover-slip. A fewdrops of glacial acetic acid are directed beneath the slip, the slide is heatedjust to boiling, and if blood has been present, reddish-brown rhombiccrystals of hsemin \vi\\ usually soon be found ; but, as stated, the test isnot wholly reliable. Leucocytes. Leucocytes are frequently seen in normal stools ; whenpus is present or discharged into the intestinal canal, they are found ingreat numbers, as in ulceration of the intestine and in abscess. 672 THE FECES. Molecular debris, or detritus, occurs in all feces as part of tlie Avaste-products. Crystals. Fat crydah are the most important. They have beenquite fully considered above. There seems to be little doubt that thecrystalline needles found in the feces are salts and fatty acids, and nottyrosiu. Fig. Collective view of the feces. (Eye-piece III., objective 8 A, Reichert.) a. Muscle-fibres, h. Con-nective tissue, c. Epithelium, d. White blood-corpuscles, e. Spiral cells. f,i. Various vegetablecells, k. Triple phosphate crystals in a mass of various micro-organisms. I. Diatoms. (VonJaksch.) Charcot-Leyden crystals, similar to those already described (see Sputum),have occasionally been met with in the stools of typhoid fever patients, indysentery, intestinal tuberculosis, and ankylostomiasis. Hsematoidin crystals occur as reddish-brown, hard, needle-shaped bodies,usually in clusters, and free or enclosed in masses of mucin or a substanceresembling it. They have been found in the feces of breast-fed infants,in cases of chronic intestinal catarrh, and, by von Jaksch, in the stools ofa case of nephritis. Crystals of various salts of calcium, of triple phosphate and cholesterinwill often be recognized, but they hav
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