Excerpt from Memoires de la Société de Physique Et d'Histoire Naturelle de Genève, 1870, Vol. 20Proceedings of the Boston Society. Vol. XI, 7 à 30, Boston, 1868 Annals of the ceum of natural history ofnew - Yorck. Vol. VIII, n°$ 15 à 17. New - Vorck, 1867 Proceedings of the American philosophical Society. Vol. X, n° 77. Philadelphia, 1867 Memoirs presented to the California Academy of Sciences. Vol. I.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.