. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. re or less microscopical examination a few ounces should be set aside ina conical test-glass for an hour or two, the clear supernatant urinepoured off from the sediment as far as possible, a small drop of theresidue placed on a slip of glass and covered with a piece of thinglass, and examined under the microscope with different magnifyingpowers. The respective appearances of the variou
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. re or less microscopical examination a few ounces should be set aside ina conical test-glass for an hour or two, the clear supernatant urinepoured off from the sediment as far as possible, a small drop of theresidue placed on a slip of glass and covered with a piece of thinglass, and examined under the microscope with different magnifyingpowers. The respective appearances of the various crystalline and organ-ized matters are given in Figs. 51-62, which were kindly drawn bythe late H. B. Brady, F. R. S., from natural specimens in the collec-tions of St. Bartholomews Hospital, Dr. Sedgwick, the late Mr. Stoddart, Mr. Waddington, and the author. Uric acid occurs in many forms, most of which are given in and 52. Flat, more or less oval crystals, sometimes attached toeach other, their outline then resembling an 8, a cross, or a star,are common. Single and grouped quadratic prisms, aigrettes,spiCula, and crystals recalling dumb-bells are met with. From urine Fig. Uric Acid. Uric Acid. acidulated by hydrochloric acid square crystals, two opposite sidessmooth and two jagged, are generally deposited; acidulated byacetic acid, more typical forms are obtained. A drop of solutionof potash or soda placed on the glass slip will dissolve a deposit ofuric acid, a drop of any acid reprecipitating it in minute but charac-teristic crystals. Cystin is very rarely met with as an urinary deposit; that fromwhich Fig. 53 was taken was found in the urine of a patient in Hospital. Lamellas of cystin always assume thehexagonal character, but the angles are sometimes ill defined andthe plates superposed: in the latter case a drop of solution ofammonia placed on the glass at once dissolves the deposit, well-marked six-sided crystals appearing as the dro
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