Excerpt from A Guide to the Practical Examination of Urine: For the Use of Physicians and Students The experimental researches of Heidenhain* have settled the question in favor of an active elaborating office on the part of the epithelium of the kidney. Heidenhain injected into the blood of animals indigo-carmine, a substance which is promptly separated by the kidneys. He removed these organs at suitable intervals after the operation and examined them minutely. In no instance did he find any of the indigo-carmine in the Malpighian capsules, but the cells lining the convoluted tubules and the Iooped tubes of Henle were filled with it, as was also the lumen of the tubes, if the animal was killed sufficiently long after the injection. Similar experiments with urate of sodium showed that it is secreted at the same place and in the same manner. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.