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

  • John Wickham Legg
Date:
1880
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. 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.

    105/128 page 95
    two or three drops of the solution of chromate of potash added. A burette divided into quar- ters of a C.C. is then filled with the standard solution of nitrate of silver, and the precuations as to filling- burettes, described in speaking of the estimation of urea (page 90) must be ob- served. The silver solution must then be al- lowed to fall into the beaker, and each drop well mixed with the urine by means of a glass rod. As each drop falls into the urine, it must be carefully watched for the least tinge of red surrounding the precipitate of chloride of silver. This reddish colour announces the approaching termination of the process, and is at first not permanent, but disappears when the fluid in the beaker is well stirred. The first drop, however, which produces a reddish tinge, not disappear- ing by agitation, indicates that the whole of the chloride present has been precipitated, and that chromate of silver is beginning to be formed. The quantity of silver solution used is now read off, and another drop let fall into the beaker from the burette, when the reddish colour ought to be heightened. From the number of C.C. used, the cjuantity of chloride is calculated; for, since i C.C. of the silver solution corresponds to
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