Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . occasionally colorless. The primary form of theuric acid crystal is that of the rhombic prism. Modifications of this, in theform of square plates, cubes, ovoids, dumb-bells, or whetstone crystals aresometimes noticed. A rare type, especially of the colorless crystals, is a per- THE URINE. 325 feet hexagon which resembles cystin so closely that chemical means of differen-tiation must be used. The crystals may be single or grouped in rosettes orfan-shaped masses. Occasionally typical ne
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . occasionally colorless. The primary form of theuric acid crystal is that of the rhombic prism. Modifications of this, in theform of square plates, cubes, ovoids, dumb-bells, or whetstone crystals aresometimes noticed. A rare type, especially of the colorless crystals, is a per- THE URINE. 325 feet hexagon which resembles cystin so closely that chemical means of differen-tiation must be used. The crystals may be single or grouped in rosettes orfan-shaped masses. Occasionally typical needle-shaped crystals may be seenwhich are arranged in sheaves. The microscopic peculiarities of uric acid are usually such as to permitof its easy recognition. In some cases, however, it is wise to confirm the micro-scopic finding by the murexid test as follows: Place a small quantity of thesediment in an evaporating dish, and add a few drops of concentrated nitricacid. Evaporate on the water-bath to dryness, when a yellowish or reddishresidue will remain. Allow the residue to cool and add a few drops of. Fig. 91 —Various forms of uric acid, i, Rhombic plates; 2, whetstone forms; 3, quadrateforms; 4, 5, prolonged into points; 6, 8, rosettes; 7, pointed bundles; 9, barrel forms pre-cipitated by adding hydrochloric acid to urine. {Hawk.) ammonium hydrate solution. presence of uric acid a distinct reddishpurple color will appear. If water be added to this purple solution and themixture evaporated to dryness the color disappears. This latter point isof importance as xanthin, which may resemble unusual types of uric acid inmicroscopic appearance, also gives the murexid test, but the color does notdisappear on heating with water. (2). Sodium Acid Urate (C5H3NaN^03). This salt of uric acid forms the bulk of the brick-dust deposit or sedi-mentum lateritium found when urine has cooled. In such cases the urinefirst shows a milky appearance and the sediment soon settles on the si
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