Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . f crystals being-rhombic prisms, wedges, dumb-bells, whetstones, prismaticrosettes, irregular rectangular or hexagonal plates, etc. Crys-tals of pure uric acid are always colorless (Fig. 89, page 249),but the form occurring in urinary sediments is impure andunder the microscope appears pigmented, the depth of colorvarying from light yellow to a dark reddish-brown accordingto the size and form of the crystal. The presence of a considerable uric acid
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . f crystals being-rhombic prisms, wedges, dumb-bells, whetstones, prismaticrosettes, irregular rectangular or hexagonal plates, etc. Crys-tals of pure uric acid are always colorless (Fig. 89, page 249),but the form occurring in urinary sediments is impure andunder the microscope appears pigmented, the depth of colorvarying from light yellow to a dark reddish-brown accordingto the size and form of the crystal. The presence of a considerable uric acid sediment does not,of necessity, indicate a pathological condition or a urine ofincreased uric acid content, since this substance very oftenoccurs as a sediment in urines whose uric acid content isdiminished from the normal merely as a result of changes in ( ui \? i- : si hi m i NTS. [23 reaction, etc. Pathologically, uric acid sediments occur ingout, acute febrile conditions, chronic interstitial nephritis,etc. If the microscopical examination is not conclusive, uricacid may be differentiated from Other crystalline urinary sedi- FlG. Various Forms of Uric Rhombic plates; 2, whetstone forms; 3, 3, quadrate forms; 4, 5, pro-longed into points; 6, 8. rosettes; 7. pointed bundles; 9, barrel forms pre-cipitated by adding hydrochloric acid to urine. ments from the fact that it is soluble in alkalis, alkali carbo-nates, boiling glycerin, concentrated sulphuric acid and in cer-tain organic bases such as ethylamine and piperidin. It alsoresponds to the murexid test (see page 249) and to Schiffsreactiqn (see page 249). Urates.—The urate sediment may consist of a mixtureof the urates of ammonium, calcium, magnesium, potassiumand sodium. The ammonium urate may occur in neutral,alkaline or acid urine, whereas the other forms of urates areconfined to the sediments of acid urines. Sodium urateoccurs in sediments more abundantly than the other urates. 324 PHYSIOLOGICAL CHEMIST
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