Excerpt from Problems in BiologyThe author wishes to thank the following for their critical reading of the manuscript in its entirety or in part or who have made valuable suggestions: Charles W. Finley, State Teachers College, Upper Montclair, New Jersey, Frank M. Wheat, Head of Department of Biology, George Washington High School, New York, Paul B. Mann, Evander Childs High School, New York.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.