The physical characters of the urine have received the most careful consideration by physicians, even in the remotest periods of medical antiquity. They did not escape the keen observation of the great founder of the Coic school; for indeed Hippocrates taught his followers to carefully observe the amount, the color and the clearness of the urine, and the differences in the appearance of the urinary sediment as indications of disease of the urinary organs. We are informed that "he even endeavored to demonstrate the influences of various foods and drinks on the constitution of the urine." Whatever may be said of the conclusions drawn from these observations—and considering the dawning faintness of scientific light in that remote period, surely but little of accuracy could be expected—yet the correctness of the observations themselves by the great father of medicine have scarcely since been questioned; indeed many of them have been handed
PURDY CW. THE SPECIFIC GRAVITY OF THE URINE, AND ITS RELATIONS TO STRUCTURAL DISEASES OF THE KIDNEYS. Read before the Chicago Medical Society, September 5, 1887. JAMA. 1887;IX(11):325–330. doi:10.1001/jama.1887.02400100005002
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