A Guide to the Examination of the Urine, Designed Chiefly for the Use of Clinical Clerks and Students

H.K. Lewis, 1876 - 102 ˹

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˹ 38 - The presence of clay is ascertained by shaking a small quantity of sand in a glass of clear water, then allowing it to stand and settle for a few hours. The sand and clay will separate into two well-defined layers.
˹ 16 - One or two drops of nitric acid are then added, and the test tube is set aside for 24 hours; at the end of that time, the proportion of the coagulated...