Excerpt from American Chemical Journal, Vol. 34: July-December, 1905 Having failed to procure Cells of the required character, we proceeded to make a microscopic study of thin sections of a considerable number of those which had been previously tested with membranes, selecting for the purpose cells which could be Classified as fairly good, bad and indifierent. It was hoped, by this means, to discover the peculiarities of texture which determine the suitability of a porous wall for experimental work and, having found them, that methods might be devised which would insure the reproduction, at will, of the essential qualities. The work along these lines is far from finished and the results are, therefore, not ready for publication. We have already succeededhhowever, in producing, in the laboratory, a few cells of almost ideal excellence and with these the meas urements of pressure here recorded were made. 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.