Excerpt from Collected Studies From the Research Laboratory, Department of Health, City of New York, Vol. 5To avoid continual cross-references in the text, the literature cited will be given at the end, arranged alphabetically according to author. The title will be given to render selection easier to those wishing to use the references.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.