Excerpt from The International Journal of Orthodontia, Vol. 4: January-December, 1918 It is then only through scientific investigation that the traditions regarding the relative relation of the dental arches, occlusion and their perversions can give way of tested truths. In orthodontia some real progress has been revealed to obscure questions during the past few years, it matters little if some of the determinants have not yet been discovered, nor if from the limited experience of our observations we failed to cover all the problems. 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.