Excerpt from The Modern Psychology Subsequent to fertilisation the single - celled ovum divides into two segments or blastomeres. These divide to form a group of four segments, which again cleave into eight, and this process of binary cell division is continued until the original single-celled ovum becomes converted into a many celled mass, termed a morula. From this multi-celled morula there will eventually be developed the countless millions of cells which go to form the human body. With further develop ment these cells will become specially modified to form the bone cells, liver cells, muscle cells, brain cells, and so on. 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.