Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . where the composition of the diet is accurately known. •39 140 PHYSIOLOGICAL CHEMISTRY. Lesions of the digestive tract, a defective absorptive functionor increased peristalsis as well as an admixture of mucus, pus,blood and pathological products of the intestinal wall may-cause the total amount of excrement to be markedly fecal pigment of the normal adult is hydrobilirubin(urobilin or stercobilin). Neither bilirubin nor biliverdinoccu
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . where the composition of the diet is accurately known. •39 140 PHYSIOLOGICAL CHEMISTRY. Lesions of the digestive tract, a defective absorptive functionor increased peristalsis as well as an admixture of mucus, pus,blood and pathological products of the intestinal wall may-cause the total amount of excrement to be markedly fecal pigment of the normal adult is hydrobilirubin(urobilin or stercobilin). Neither bilirubin nor biliverdinoccurs normally in the fecal discharge of adults, although theformer may be detected in the excrement of nursing most important factor, however, in determining the colorof the fecal discharge is the diet. A mixed diet for instance produces stools which varyin color from light to darkbrown, an exclusive meatdiet gives rise to a brown-ish-black stool, whereas thestool resulting from a milk-diet is invariably light col-ored. Certain pigmentedfoods such as the chloro-phyllic vegetables, and var-ious varieties of berries, each Fig. 47-. H^matoidin Crystals from Acholic Stools. (v. Jaksch.)Color of crystals same as the color ofthose in Fig. 41, p. 119. afford stools having a char- acteristic color. Certaindrugs ?ct in a similar wayto color the fecal discharge. This is well illustrated by theoccurrence of green stools following the use of calomel andof black stools after bismuth ingestion. The green color ofthe calomel stool is generally believed to be due to Jaksch however claims to have proven this view to be in-correct since he was able to detect hydrobilirubin (or urobilin)but no biliverdin in stools after the administration of bismuth stool derives its color from the black sulphidewhich is formed from the subnitrate of bismuth. In casesof biliary obstruction the grayish-white acholic stool is normal conditions the odor of feces is
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