. Urinary analysis and diagnosis by microscopical and chemical examination. ily be differentiated from them by its insolubility in acetic acid. 7, 8. Leucin and Tyrosin.—Leucin and tyrosin are rare sediments,,and usually occur together. They are never seen in normal urine, bu1mostly in severe acute and usually fatal diseases of the liver, such as CRYSTALLINE AND AMORPHOUS SEDIMENTS. 83 1 acute yellow atrophy of the liver, phosphorus-poisoning, and in yellowfever. They have also been found in cases of smallpox, scarlet fever, andtyphoid fever. Leucin (see Fig. 32) appears under the microscope i
. Urinary analysis and diagnosis by microscopical and chemical examination. ily be differentiated from them by its insolubility in acetic acid. 7, 8. Leucin and Tyrosin.—Leucin and tyrosin are rare sediments,,and usually occur together. They are never seen in normal urine, bu1mostly in severe acute and usually fatal diseases of the liver, such as CRYSTALLINE AND AMORPHOUS SEDIMENTS. 83 1 acute yellow atrophy of the liver, phosphorus-poisoning, and in yellowfever. They have also been found in cases of smallpox, scarlet fever, andtyphoid fever. Leucin (see Fig. 32) appears under the microscope in the form of flat,yellowish or brown globules of different sizes, with delicate radiating andoncentric striations. Tyrosin is found in the form of needle-shapedrystals, grouped in clusters or sheaves, crossing at various angles. Both leucin and tyrosin somewhat resemble fat, the former the fat-lobules, the latter the needles of fat—so-called margaric acid—but differrom fat by being insoluble in ether. 9. Calcium Sulphate.—Calcium sulphate (see Fig. 33) occurs in. Fig. 33.—Calcium-sulphate Crystals (X 500). rine in a small number of cases only, the specific gravity of the urineeing, as a rule, high. It consists of thin, colorless prisms or needles,ther single, in groups, or in rosettes, resembling crystalline calciumhosphate, but more regular. Its clinical significance is not known. aci B. ALKALINE SEDIMENTS. 1. Triple Phosphates.—Triple phosphates, the combined ammonio- lentliagnesian phosphates, may be divided into complete and incomplete. ,bu hey may be found under the microscope in small numbers in urines hich still give a faintly acid reaction, but invariably denote a change to 84 URINARY ANALYSIS AND DIAGNOSIS. alkalinity. When present in large numbers, the urine is always alkaline,These phosphates are frequently secondary formations, not being seenwhen the urine is freshly voided, but being found in varying numbers-afew hours later. They may be seen to develo
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