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Excerpt from Acta Mathematica, 1921, Vol. 38 Le pre'sent volume e'tait peu prés imprimé il v a 5 ans, mais sous la pression des malheurs qui pendant cette pe'riode ont frappé les diffé rents peuples de la terre, on a cru ne devoir le publier que maintenant. 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.