. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . alled whetstone-form shown in Fig. 94. MICROSCOPICAL EXAMINATION OF CUE URINE. 501 The crystals may occur singly or arranged in groups. Accidentalimpurities, such as threads or hairs, arc at times covered with suchcrystals, forming long cylinders. Very frequently uric acid crystal-lizes in the form of large rosettes composed of drawn-out whetstone-crystals, presenting a deep-red color, referable to uroerythrin, whenthey are often visible to the naked eye, and
. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . alled whetstone-form shown in Fig. 94. MICROSCOPICAL EXAMINATION OF CUE URINE. 501 The crystals may occur singly or arranged in groups. Accidentalimpurities, such as threads or hairs, arc at times covered with suchcrystals, forming long cylinders. Very frequently uric acid crystal-lizes in the form of large rosettes composed of drawn-out whetstone-crystals, presenting a deep-red color, referable to uroerythrin, whenthey are often visible to the naked eye, and form the well-knownbrick-dust sediment. While it is generally stated that uric acidcrystals can always be recognized by their color, which may varyfrom a light yellow to a dark brown, this is, in my experience, notthe ease. I have often seen uric acid sediments in which thecrystals formed small rhombic plates with rounded edges, andwere absolutely devoid of coloring-matter, so far as a microscopicalexamination could show (Fig. 104). Uric acid dumb-bells arealso at times observed, and may be mistaken for calcium oxalate. Fig. Colorless crystals of uric acid. Hexagonal plates of uric acid have been similarly confounded witheystin. A uric acid sediment may be observed in cases in which an in-creased excretion of uric acid occurs ; but it should be rememberedthat, as a rule, it is not permissible to infer an increased productionor elimination from the presence of an abundant deposit of this sub-stance alone. Brick-dust sediments are frequently observed duringcold weather; but it would be erroneous to infer an increased elimi-nation from such an occurrence, as the phenomenon is owing tothe fact that uric acid is less soluble in cold than in warm the summer month-, for the same reason, a deposit of uricacid is less frequently observed, although an increased amount maynevertheless be present, being held in solution owing to the highertemperature. The more concentrat
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