A practical treatise on urinary and renal diseases : including urinary deposits . nor by thevegetable acids. It is instantly dissolved by caustic ammonia, CYSTINE. 85 and if the solution be exposed in a watch-glass to evaporationin the air, beautiful six-sided crystals are obtained as the volatilealkali exhales (Fig. 15). This is the characteristic reaction ofcystine, and leads to its easy identification. Cystine is alsosoluble in the carbonates of the fixed alkalies ; but not in car-bonate of ammonia, which indeed is its best precipitant fromacid solutions. It is soluble also in the mineral a
A practical treatise on urinary and renal diseases : including urinary deposits . nor by thevegetable acids. It is instantly dissolved by caustic ammonia, CYSTINE. 85 and if the solution be exposed in a watch-glass to evaporationin the air, beautiful six-sided crystals are obtained as the volatilealkali exhales (Fig. 15). This is the characteristic reaction ofcystine, and leads to its easy identification. Cystine is alsosoluble in the carbonates of the fixed alkalies ; but not in car-bonate of ammonia, which indeed is its best precipitant fromacid solutions. It is soluble also in the mineral acids, butinsoluble in acetic and tartaric acids. It is insoluble in waterand alcohol. Heated on a platina foil, it evolves thick whitefumes, having a peculiar offensive odour resembling garlic. Cystine is a body of very weak affinities, without taste orsmell; it acts as a feeble base, and forms crystalline compoundswith nitric and hydrochloric acids. According to Pelouze itmay also play the part of an acid ; he obtained two compoundswith silver, which he denominated cystates.*. Fig. 15. Cystine. Hexagonal tablets and prisms from an evaporated ammoniacal solution. A spontaneous deposit of cystine in urine is composed ofhexagonal tablets. When the ammoniacal solution of cystine * Note sur la cystine by Pelouze, appended to Civiales Memoire surles calculs cle cystine, at p. 441 of Civiales treatise Du traitement medical dela pierre. Some further considerations respecting the constitution and physio-logical relations of cystine may be found in a paper by J. Dewar and A. Gamgee,in the Journ. for Anat. and Physiol. 1870. S6 - INORGANIC DEPOSITS. is allowed io evaporate in the air, magnificent crystals areobtained, which furnish brilliant objects for the is dimorphous, and crystallises in two forms, namely,as six-sided tablets and square prisms (see Fig 15). The ammoniacal solution generally deposits hexagonal platesonly, or these mixed with a few prisms ; sometimes
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