Examination of the urine; a manual for students and practitioners . he amorphous form into small dumb-bells, and finally into the globules of ammonium urate, thechange marking the transition of the acid sediment into analkaline. Rarely ammonium urate occurs in the shape ofhighly refractive colorless or yellowish needles or old urines it may occur as tufts of needles, sheaves, orstars. On addition of HC1 they dissolve and uric acidcrystals appear, a reaction which distinguishes them fromleucin. Method of Dealing with Amorphous Urates.—Asediment, consisting largely of amorphous urates,
Examination of the urine; a manual for students and practitioners . he amorphous form into small dumb-bells, and finally into the globules of ammonium urate, thechange marking the transition of the acid sediment into analkaline. Rarely ammonium urate occurs in the shape ofhighly refractive colorless or yellowish needles or old urines it may occur as tufts of needles, sheaves, orstars. On addition of HC1 they dissolve and uric acidcrystals appear, a reaction which distinguishes them fromleucin. Method of Dealing with Amorphous Urates.—Asediment, consisting largely of amorphous urates, is diffi-cult to examine, as many of its other elements are obscuredby the abundant granules of urates. The latter may beeliminated in the following manner: The urine is allowedto settle thoroughly, is decanted, and the amount of urinedecanted from the sediment is replaced by an equal amountof warm water. This dissolves the urates, and the sedi-ment may now be allowed to settle again or is centrifuged,and may be examined for elements other than urates. PLATE 8. Ammonium Urate, showing Spherules and Thorn-apple-shapedCrystals {after Peyer). UNORGANIZED SEDIMENTS 259 The warm water also swells and renders colorless anynormal blood-cells present. Boiling water should not beused for fear of coagulating any albumin present and thusrendering the sediment unfit for examination. A methodwhich saves time, but which is not applicable to albuminousurines, is as follows: The sediment containing urates isvery gently heated on a slide over an alcohol flame, and,if necessary, a few drops of warm water are added. Theurates dissolve, leaving the other elements visible. Clinical Significance of Urates.—Deposits of amor-phous urates are often found in highly acid or highly con-centrated urines, as, for example, in acute fevers. Theyare often seen also in diseases of the heart, liver, and kid-neys. Ammonium urate is frequently found in the urineof newborn children. Before drawing any conclusi
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