Excerpt from The Boston Medical and Surgical Journal, Vol. 184: June 23, 1921 For example, the power expended in the leg which kicks a football across the field must be resisted by an equality of stress somewhere within the structure, and this area of resistance must equalize the stress of all muscles con cerned in the action. If not absorbed in the legitimate joint at the head of the femur and the acetabulum, through the equalized support of all the deep-lying tissues of that articula tion, and the equalized resistance of the fibers of these tissues at their, origin, compensatory action and thereby strain, must be conveyed to the spine. This would weaken the muscular support around the. Fifth lumbar and the sacro iliac. 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.