Excerpt from Alternating Generations: A Biological Study of Oak Galls and Gall Flies While pursuing the study of galls as a branch of comparative pathology, I was fortunate eugh to become acquainted with Dr. Adler's mograph of Alternating generations in oak gall-flies. The originality of the matter, and the important light which it threw on some of the great biological problems of the day, induced me to ask his permission to publish it in an English dress. I have to thank him for the generous manner in which he placed his work, and the beautiful drawings which accompanied it, at my disposal. Unfortunately the stones from which the illustrations were printed had been broken up, but I venture to think that they have been very faithfully reproduced. In the Introduction, and especially in the description of Cynips Kollari in the Appendix, I have used freely the writings of Dr. Beyerinck and Professor Mayr. I have added an analytical table of galls, a short bibliography, and a list of the Cynipidae. 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 techlogy 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.