. Urinary deposits : their diagnosis, pathology, and therapeutical indications. rm, are very remark-able ; all of them, however, may be traced to somemodification of the rhombic prism, which may beassumed as the normal crystalline form of this sub-stance. But two varieties can be artificially obtained,by filtering a warm solution of urate of potass or am-monia, into dilute and warm hydrochloric acid ; eitherperfect rhomboids, or square tables, generally excavatedat the sides into an imperfect hour-glass figure, being obtained. The latter havebeen erroneously described,both in this country and
. Urinary deposits : their diagnosis, pathology, and therapeutical indications. rm, are very remark-able ; all of them, however, may be traced to somemodification of the rhombic prism, which may beassumed as the normal crystalline form of this sub-stance. But two varieties can be artificially obtained,by filtering a warm solution of urate of potass or am-monia, into dilute and warm hydrochloric acid ; eitherperfect rhomboids, or square tables, generally excavatedat the sides into an imperfect hour-glass figure, being obtained. The latter havebeen erroneously described,both in this country and inAmerica, as identical with thedumb-bell deposits of oxalateof lime, to which they have noanalogy whatever, except in adistant resemblance in varieties cannot alwaysbe produced at will, and ap-pear to depend upon the strength of the solution of theurate employed, and temperature of the dilute with polarised light, the transparent crystalsof uric acid exhibit a beautiful series of coloured bands,particularly with slowly precipitated specimens ; their. MICROSCOPIC CHARACTERS. 125 brilliancy of tint is only equalled by that of the scalesof the diamond beetle. 123. The crystalline forms of urinary deposits canbe examined by merely placing a drop of the turbidurine on a plate of glass, and examining it with amicroscope under a good half-inch achromatic object-glass. By far the most satisfactory mode is, however,the following, which, by rendering the crystals distinct,amply repays the trouble it requires. Allow the urineto repose for a short time in a tall vessel, decant thegreater proportion, and pour a tea-spoonful of thelowest turbid layer into a watch-glass, gently warming-it to dissolve any urate of ammonia, and to aid thedeposition of the deposit. Remove the supernatanturine with a pipette, and replace it with a few dropsof water ; then place the watch-glass under the micro-scope, and the crystals covered by the water will be-come most beautifully dist
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecturinary, bookyear1853
