A guide to the examination of the urine in health and disease, for the use of students / by Alfred Markwick.

Date:
1847
Catalogue details

Licence: Public Domain Mark

Credit: A guide to the examination of the urine in health and disease, for the use of students / by Alfred Markwick. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    a dirty yellowish white, and the last of a more or less deep yellow, sometimes approaching to a dark brown, or even black. 5. Dr. Front is of opinion that the colour of the urine is due to the presence of two colouring prin- ciples, one of which is closely alhed to lithic acid and lithate of ammonia, and gives them their yel- low colour, and the other to some modification of the colouring matter of the bile; and he believes both to be intimately connected one with the other fi’om the circumstance that lithic acid and the biliary colouring principle are similarly affected by nitric acid. Simon beheved the first to be identical with the yellowish brown matter, viz. the hcema- phdein that is extracted from the dried serum of the blood by ether and alcohol.* Becquerel also supposes the colouring matters of the urine to be composed of two others; one of a greenish and the other of a reddish colour, and he states that the latter generally predominates when the urinary se- cretion is high coloured and loaded with uric acid and organic matters. This is perfectly in accord- ance with Dr. Front’s statement. Berzelius has applied the term halophyle to the yellow colouring matter of the urine, in consequence of the great difliculty of separating it from the saline principles of the secretion. Heller, on the other hand, has Simon’s Haiidbuch, b. 1. s. 328.