Excerpt from History of the Discovery of the Circulation of the Blood The name of Herophilus ought to be familiar to all students of anatomy, as many parts of the human body, such as the Choroid Plexus, the Torcular Herophili, the Calamus Scripto rius, the Duodenum, etc., were first described by him. The most important contribution that he made to our knowledge of the vascular system was the demonstration of the isochronism of the pulsations of the arteries and of the beating of the heart, and of the latter being the cause of the former, a phenomena that had already been imperfectly referred to by Hippocrates and Aris totle. Herophilus noticed also the difference in the thickness of the walls of the arteries and of the veins, and described the vessels connecting the heart and the lungs, distinguishing the pul monary artery from the pulmonary vein, designating the former as the arterial vein and the latter as the venous artery. 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.