Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . yish-white ring just at the junction of the nitric acid and urine when this test isapplied. Below the ring there is a greenish zone extending somewhat intothe acid, above it a reddish somewhat smaller zone. If this substance issuspected, the urine should be extracted by agitation with an equal volume ofpetrolic ether. A somewhat similar reaction has been reported by Kenney^in cases in which several drops of formalin were added as a preservative to asmall amount of urine. Besides these
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . yish-white ring just at the junction of the nitric acid and urine when this test isapplied. Below the ring there is a greenish zone extending somewhat intothe acid, above it a reddish somewhat smaller zone. If this substance issuspected, the urine should be extracted by agitation with an equal volume ofpetrolic ether. A somewhat similar reaction has been reported by Kenney^in cases in which several drops of formalin were added as a preservative to asmall amount of urine. Besides these rings at the zone of contact, a further white or yellowishring may be observed at this point. This ring is found in urines which areespecially rich in urea and appears as a distmctly crystalline ring due to theformation of urea nitrate. If the urine be previously diluted this ring does notappear. If an excess of uric acid be present in the urine, we observe, onallowing the tube to stand for a few minutes, a distinct white ring in the urineabout I to 2 cm. above the point of contact of the acid and
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