Excerpt from The Germ-Cell Cycle in AnimalsThis book is the result of a course of lectures delivered during the past school year before a class in Cellular Biology at the University of Michigan. Many of the most important recent additions to our knowledge of heredity have resulted from the study of the germ cells, especially those of animals. This study is now recognized as one of the chief methods of attacking certain problems in genetics and must be employed in correlation with animal breeding before we can hope to obtain an adequate explanation of the results of hybridization. For tunately the cytological studies of the germ cells, both observational and experimental, have kept pace with the rapid advances in our knowledge of plant and animal breeding which have been made since the rediscovery of Mendel's investigations in 1900. The term germ-cell Cycle is meant to include all those phenomena concerned with the ori gin and history of the germ cells from one genera tion to the next generation. The writer has, with few exceptions, limited himself to a consideration of the germ cells in animals because the cycle is here more definite and better known than in plants.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.