On diseases of the bladder and prostate gland / By William Coulson.

  • William Coulson
Date:
1840
Catalogue details

Licence: Public Domain Mark

Credit: On diseases of the bladder and prostate gland / By William Coulson. Source: Wellcome Collection.

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    animal charcoal; decompose the nitrate of urea by carbonate of potash, and evaporate the filtered liquor, by a gentle heat, to dryness ; treat the resi- due with pure alcohol, which dissolves only the urea, and this, when concentrated, yields the urea crystallized. Should any colouring matter adhere, again treat the urea with alcohol and animal char- coal, and re-crystallize. The mode which Dr. Prout commonly uses to detect an excess of urea, is to put a little urine into a watch-glass, and carefully add to it nearly an equal quantity of pure nitric acid, in such a manner that the acid may easily subside, from its greater specific gravity, to the lower part of the glass, and allow the urine to float about it. If spontaneous crystallization takes place, an excess of urea is indicated ; and the degree of excess can lie inferred, nearly enough for practical purposes, by the greater or less time which elapses before the crystallization takes place, and which may vary from a few minutes to two or three hours. Such urine is commonly, but not always, of a pale colour. Lithic or uric acid.—This acid, when pure, is perfectly colourless, and is easily detected in urine by the addition of a little hydrochloric acid. After standing for three or four hours, a red crys- talline precipitate will be found, which is lithic acid, tinged with the colouring matter of the urine. If it be wished to obtain the acid quite pure, let the crystals be dissolved in liquor potassae, that is,
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