. Kirkes' handbook of physiology . Fig. 295.—Various Forms of Uric Acid Crystals. Fig. 296.—Crystals of Hippuric Acid. ceeding that of the uric acid. The quantity excreted is increased by avegetable diet. Hippuric acid appears to be formed in the body from benzoic acid orfrom some allied substance. The benzoic acid unites with glycin, and hip-puric acid and water are formed thus: -f = + H20. Benzoic Acid Glycin Hippuric Acid Hippuric acid is the one substance which has been clearly demonstratedto be formed by the kidney itself. Kreatinin. This substan

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. Kirkes' handbook of physiology . Fig. 295.—Various Forms of Uric Acid Crystals. Fig. 296.—Crystals of Hippuric Acid. ceeding that of the uric acid. The quantity excreted is increased by avegetable diet. Hippuric acid appears to be formed in the body from benzoic acid orfrom some allied substance. The benzoic acid unites with glycin, and hip-puric acid and water are formed thus: -f = + H20. Benzoic Acid Glycin Hippuric Acid Hippuric acid is the one substance which has been clearly demonstratedto be formed by the kidney itself. Kreatinin. This substance is present in urine in a remarkablyconstant quantity, as shown recently by Folins analyses. Its daily excre-tion quantity is from 1 to 15 grams according to the amount of active tissuein the individual. It is of especial importance as a measure of the metab-olism of muscle protoplasm. Ammonia. A considerable daily quantity of ammonia in com-bination is found in the urine, showing that this is an important method ofnitrogen

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