Excerpt from Proceedings of the Scientific Association of the Johns Hopkins University, 1894-95 In the first place, the line of separation between the rudiment and the vesicle is seen with perfect clearness to be everywhere intact, and, further more, the cells of the rudiment are identical in appearance with the free mesenchyme cells; the latter are, moreover, more numerous in this region than elsewhere. During the early stages of development, that is before the rudiment has become very compact, the similarity between these cells is very evident, Fig. IV, A. I therefore conclude that, just as in the case of the pericardium, the common rudiment of the dorsal tube and nerve ganglion is formed by free mesenchyme cells. The cells of the rudiment are at first loosely and irregularly piled on one another, but soon the mass becomes more closely packed and assumes a cylindrical form, Fig. IV, B. Other mesenchyme cells are added to the string from the outside, and active cell division goes on within the mass. 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.