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Excerpt from Bulletin de Géographie Botanique, 1916, Vol. 26: Organe Mensuel de l'Académie Internationale de Botanique Nous savons tous que les causes capables de modifier les carac1ères propres d'une plante sont nombreuses, mais aussi que leurs effets sont très différents et plus ou moins profonds. La plante résiste énergiquement à la plupartde ces causes, et nous connaissons encore très mal celles qui peuvent changer ou faire disparaître certains de ses caramères. 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.