Urinary deposits : their diagnosis, pathology, and therapeutical indications / by Golding Bird.

  • Bird, Golding, 1815-1854.
Date:
1853
Catalogue details

Licence: Public Domain Mark

Credit: Urinary deposits : their diagnosis, pathology, and therapeutical indications / by Golding Bird. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    per, by which, if lactic acid be present, a lactate of copper is formed, and on adding some milk of lime oxide of copper will be precipitated. On throwing the whole on a filter, the fluid which passes through will be found free from copper : unless lactic acid is present, in which case, distinct traces of the metal can be de- tected, by acidulating the fluid with a drop of sulphuric acid, and immersing a polished piece of iron wire, which will become in a short time coated with copper. I must confess, however, that I do not feel much confidence in this test of M. Pelouze. 93. Creatine and creatinine.—These very interesting substances of which some account has already been given (40), were first discovered in the urine by Dr. Pettenkofer, and were supposed to be peculiar to that secretion, until Professor Liebig, after some masterly researches, proved them to be identical with the crys- tallised body described many years ago by Chevreul in the juices of flesh. Evidence of their existence in the urine may be obtained in the manner already described (6), but to procure them in any quantity, the process described by Liebig is by far the best. He removes the acidity of healthy urine by the addition of a little lime, and then adds chloride of calcium, until no fur- ther precipitate of phosphate of lime takes place. The filtered fluid is then evaporated to a syrupy consistence, and after the crystallisation of salts from it, the super- natant fluid is decanted, and mixed with a saturated solution of chloride of zinc in the proportion of half an ounce to a pound of the extract of urine. In a few days, an abundant deposit of yellow granules, generally closely adhering to the vessel, will have appeared.