Excerpt from Modern Problems of Biology: Lectures Delivered at the University of Jena, December, 1912 To their Royal Highnesses, the Grand-duke and the Grand duchess of Saxony, the author expresses his thanks for their interest and for the great honor of their presence at one of the lectures. He has pleasure in thanking also their Excellencies, the Ministers of Education of saxe-weimar - Eisenach, Altenburg and Meiningen, his Magnificency the Prorektor, the Curator of the University and his Colleagues for their encouragement and hospitality, by which the visit to Jena was made very delightful. The lectures were written and have already been published in German by Gustav Fischer in Jena. Professor von Bar deleben had the great kindness to revise the original manu script. The translation has been prepared by the author and follows the original closely, though now and then a phrase has been rendered freely. 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.