Excerpt from Twentieth Century Practice, 1897, Vol. 12 of 20: An International Encyclopedia of Modern Medical Science by Leading Authorities of Europe and America; Mental Diseases, Childhood, and Old Age The grey substance and white substance of the brain differ widely as regards their supply of blood. The former is supplied by the arteries of the pia mater, and the quantity of blood thus brought is very large. The white matter of the cerebrum is supplied by small arteries which come off at right angles from the three cerebral arteries near their origin, and the supply is not nearly so abundant. 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.