Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . Urates, a, of Sodium, b, of of Calcium. by dropping a fragment of oxalicand setting aside for several of Calcium is rarel) Fig. 55. found in the urine of man, butfrequently in that of the horseand other herbivorous urine containing car-bonate of calcium often reddenslitmus paper ; and it is only afterthe removal, on standing, of theexcess of carbonic
Chemistry : general, medical, and pharmaceutical including the chemistry of the ; a manual on the general principles of the science, and their applications in medicine and pharmacy . Urates, a, of Sodium, b, of of Calcium. by dropping a fragment of oxalicand setting aside for several of Calcium is rarel) Fig. 55. found in the urine of man, butfrequently in that of the horseand other herbivorous urine containing car-bonate of calcium often reddenslitmus paper ; and it is only afterthe removal, on standing, of theexcess of carbonic acid that thesalt is deposited. It consists ofminute spherules, varying insize, the smaller ones often inprocess of coalescence. Thedumb-bell form thus producedis easily distinguished from simi-lar groups of uric acid or oxa-late of calcium by showing ablack cross in . each spherulewhen viewed by polarized acid dissolves carbonateof calcium, liberating carbonicacid gas, with visible effervescence (under the microscope) if the slidehas been previously warmed and a group of crystals be Carbonate of Calcium URINARY SEDIMENTS. 501 Hippuric Acid.—The pointed rhombic prisms and acicular crystalsare characteristic, and easily recognized. The broader crystals maypossibly be mistaken for triple phosphate, and the narrower for cer-tain forms of uric acid ; but insolubility in acetic acid distinguishesthem from the former, and solubility in alcohol from the tests may be applied while the deposit is under microscopicobservation. An alcoholic solution of hippuric acid evaporated todryness, and the residue treated with water, gives a solution fromwhich characteristic crystalline forms of hippuric acid may be obtainedon allowing a drop to dry upon a slip of glass. The organized deposits in urine entail greater care in their determi-nation, and usually require a higher magnifying power for theirproper examination, than those of crystalline form. The figu
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