Excerpt from The Psychology of AlgebraWe wish to acknowledge here our indebtedness to all those who have helped, some repeatedly, in our investiga tions. The list is far too long to print, over two hundred teachers and scientific workers having given information or advice or expert opinion. We thank also those Who have Offered us facilities for experiment which lack Of time pre vented us from using.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.