Excerpt from Studies in Parasitology and General Zoology These views are highly interesting, and based as they are upon the work of experienced investigators demand careful consideration. That the results obtained by these observers involve the general con elusion that the islets cannot be regarded as in any sense a tissue sui generis appears to me however, premature, and ex parte in the sense that such a conclusion does not allow 'for certain established facts in the morphology of these structures. I propose therefore to deal briefly with some of the difficulties which appear to me to lie in the way of a full acceptance of this conclusion. 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.