Carpenter's principles of human physiology . e remotely from lecithin. Cholalic Acid or Cholic Acid, C24H40Os, is obtained from glycocholic acidby the action of alkalies. It crystallizes either in four-sided prisms with dihedralsummits, in octahedra, or in tetrahedra, which are easily soluble in alcohol,but not readily in water or ether. On boiling with acids, or on being heatedto 200° C, it yields Dyslysin (C24H3603),which is only soluble in ether. Cholicacid has a pure bitter taste, and whentreated with nitric acid it yields acetic,valerianic, capronic, oxalic, and choles-terinic acids. One
Carpenter's principles of human physiology . e remotely from lecithin. Cholalic Acid or Cholic Acid, C24H40Os, is obtained from glycocholic acidby the action of alkalies. It crystallizes either in four-sided prisms with dihedralsummits, in octahedra, or in tetrahedra, which are easily soluble in alcohol,but not readily in water or ether. On boiling with acids, or on being heatedto 200° C, it yields Dyslysin (C24H3603),which is only soluble in ether. Cholicacid has a pure bitter taste, and whentreated with nitric acid it yields acetic,valerianic, capronic, oxalic, and choles-terinic acids. One form rotates polar-ized light 35° to the right, the other 50°. Taurin, C2H7N03S, is found as a con-stant constituent of the bile in com-bination with cholic acid. It has alsobeen occasionally discovered in theblood and urine, in the tissue of thekidney, lungs, and of the striated forms large tasteless and colourless four- or six-sided prisms, with four-sided * Proceedings of the Eoyal Society, vol. xv. No. 83, p. Fig. Taurin. 82 CHEMICAL COMPOSITION OF THE BODY. pyramids at their extremities. It dissolves in fifteen parts of cold water, andthe solution is neutral to test-paper. Taurin is decomposed when subjectedto a heat greater than 464° F. Glycin (Glycocol, Glycocin, or Gum Sugar), C2H3(NH2)02, is chiefly foundin combination with cholic acid in the bile, but it also occurs combined withbenzoic acid, as hippuric acid, in the blood and urine. It crystallizes in largecolourless rhombohedral crystals, which melt at 354° F., are easily soluble inwater, but with difficulty in alcohol. The solutions are acid to test-paper,and sweet to the taste. It acts both as a base to acids, and as an acid toalkalies. It originates as the product of the disintegration of gelatin and ofalbumin, and has been artificially formed. G-lycocholic and Taurocholic Acids, CLKLNC* and C„.H.,NO,S. —When iso 4o 6 jJb4o 7 to a solution of crystallized ox-bile neutral acetate of l
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