On various modes of testing for albumen and sugar in the urine : two lectures / by George Johnson.

  • George Johnson
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: On various modes of testing for albumen and sugar in the urine : two lectures / by George Johnson. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

    16/78 (page 4)
    It sometimes happens that, when nitric acid is added to highly acid urine, it causes a turbid deposit of urates, which might be mistaken for an albuminous coagulum. The distinction is readily made by the application of heat, which dissolves the urates, but not the albuminous precipitate. In the urine of patients who are taking copaiba, nitric acid, acting on the resin, causes a slight milkiness, which has sometimes been mistaken for albumen. Such urines have a peculiar resinous odour; although acid, they are not coagulated by heat, nor, as I shall presently show you, by picric acid, which is a most delicate test for albu- men. When an excess of nitric acid is added to a highly concentrated urine, it sometimes happens that a copious crystallisation of nitrate of urea gradually occurs. This slowly formed crystalline deposit could scarcely be mistaken for an amorphous coagulum of albumen. With regard to nitric acid as a test for albumen I have yet to show you certain facts which require attention. To this specimen of highly albuminous urine I add a single drop of strong nitric acid. You see that it forms a white coagulum which, on