Excerpt from Annual Report of Program Activities: National Institutes of Health, 1963-1964Air-conditioning equipment in the new wing pumps cool, sterile air (less than 1 organism/100 cu. Ft.) into the operating rooms through ceiling vents above the operating table and exhausts air through low-level vents. Thus micro-organisms are pulled out near the floor, bypassing the patient.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.