Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879. Excerpt: ... linen thread, 6-8 drops of glacial acetic acid are added; the whole is allowed to stand for 24 hours at i5C. Adding to an alkaline solution of uric acid a diluted solution of cupric sulphate will produce a white precipitate of cuprous urate; if an excess of sulphate of copper is added and then boiled, the red cuprous oxide will be precipitated. The oxygen from the cupric oxide is used for oxidation of the uric acid (we therefore find in the solution urea, allantoine and oxalic acid). This alkaline solution of uric acid will also reduce nitrate of silver. If the two are mixed, in small quantities, upon the filter, there is found a black (if there be 1-1000 uric acid) or, (if 1-500,000 be present) a brownish yellow spot. By means of ozone, in the presence of an alkali, uric acid is converted into urea, ammonia, oxalic acid and carbonic acid; when the alkali is absent, into urea, carbonic acid and allantoine. Uric acid is a bibasic acid, and, as a result, two series of salts are formed, neutral and acid. The neutral salts are more readily soluble in water than the acid salts. Acid urate of soda requires 124 parts of boiling and 1150 parts of cold water to dissolve it. Therefore, if we find urates in the sediment, we know that they are acid salts. On the other hand, if we find urates in solution, especially after the urine has acquired the temperature of the room, we can assume that they are, principally, neutral. This view is supported by the fact that if an urine corresponding to the preceding is decomposed by a strong acid, muriatic or nitric, the whole urine, at first, becomes cloudy. If this cloudiness is examined under the microscope, we see that it is produced by amorphous points, which are acid urate of sodium. After having stood for some time, the mi...
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