Excerpt from Miscellanea Entomologica, Vol. 18: Revue Entomologique Internationale, Novembre 1910Ou parle souvent de variations, mais il est fort rare que l'on puisse observer, clans la nature, les étapes successives de ce curieux phénomène, principalement chez les animaux.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.