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Excerpt from The Development of the Adrenal Glands of Birds The trunks of the Venous trees have increased greatly in size and form large central vessels which may be compared to the central vein of the adrenal gland of mammals. The sinusoidal character of the venous blood vessels persists in the adult and even in the largest vessels very little connective tissue is found in the walls. Near the close of the period of incubation, the Venous blood was found entering the postcava by means of two separate veins from each gland. This condition is not found in the adult. The two Veins anastomose on the ventral surface of the gland and the blood from both venous trees enters the post cava through a common vein (fig. The arterial system of the glands is essentially the same as that described for the embryo. Since this is true, it is evident that the mesonephric arteries from which they derived part of their blood supply have persisted as the renal arteries. 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.