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 . d. Urates redissolve when warmed with the supernatant urine. Urates of Sodium and Magnesium, though generally amorphous, occasionally take a crystalline form—bundles or tufts of small needles —as shown in the cut. Oxalate of Calcium commonly occurs in octahedra requiring high magnifying power for their detection. The crystals are easily over-looked if other matters are pre-sent, but are more disti
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 . d. Urates redissolve when warmed with the supernatant urine. Urates of Sodium and Magnesium, though generally amorphous, occasionally take a crystalline form—bundles or tufts of small needles —as shown in the cut. Oxalate of Calcium commonly occurs in octahedra requiring high magnifying power for their detection. The crystals are easily over-looked if other matters are pre-sent, but are more distinctly seenafter phosphates have been re-moved by acetic acid. In certainaspects the smaller crystals looklike square plates traversed bya cross. A dumb-bell form ofthis deposit is also sometimesseen, resembling certain formsof uric acid and the coalescingspherules of a much rarer sedi-ment — carbonate of of calcium is insolublein acetic but soluble in hydro-chloric acid. The octahedra arefrequently met with in the urineof persons who have partaken ofgarden rhubarb; the crystalsmay often be deposited artifi-cially (according to Waddington)acid into several ounces of urine. 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
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