A guide to the examination of the urine : designed chiefly for the use of clinical clerks and students / By J. Wickham Legg, M.D.

  • John Wickham Legg
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: A guide to the examination of the urine : designed chiefly for the use of clinical clerks and students / By J. Wickham Legg, M.D. Source: Wellcome Collection.

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

    35/120 (page 23)
    About a couple of drachms of tliis test-solution ai'e poured into an ordinary test-tube^ and the fluid boiled over a lamp. If no deposit occur, the solu- tion may be used for analysis ; but if a red preci- pitate be thrown down, the liquid has decomposed, and a fresh supply must be obtained. While the solution is boiling in the test-tube, the urine must be added to it drop by drop, and the effect watched. A few drops of urine which, contain a large percentage of sugar will at once give a precipitate of yellow or red suboxide; but if no precipitate occur, the urine should be added to the fluid, drop by drop, any deposit being carefully looked for, until a quantity equal to that of the Fehling^s solution employed, have been added. If no precipitate be found after allowing the test- tube to remain at rest for an hour, the urine may be considered free from sugar. Cautions, i. The test solution should never be employed without previous boiling for a few seconds; the tartrate being exceedingly apt to decompose, and the solution then reduces cojDper as effectually as would grape sugar. ii. The quantity of urine used in the test shoulc] never be greater than the quantity of test solution employed.