Excerpt from The Journal of Biological Chemistry, 1918, Vol. 33 The method described in this paper was used in the examination of over 500 stools to be tested for occult blood with satisfactory results. Before carrying out the test, the patient was kept for at least 2 days on a meat-free and soup-free diet. Although a light green color indicated small quantities of blood, for clinical purposes, we chose to report such cases as doubtful and considered only those cases positive in which a dark green or blue color was obtained. 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.