Excerpt from The Ecological Relations of the Vegetation on the Sand Dunes, of Lake Michigan: A Dissertation Submitted to the Faculties of the Graduate Schools of Arts, Literature, and Science, in Candidacy for the Degree of Doctor of Philosophy, Department of Botany The province of ecology is to Consider the mutual relations between plants and their environment. Such a study is to structural botany what dynamical geology is to structural geol ogy. Just as modern geologists interpret the structure of the rocks by seeking to find how and under what conditions similar rocks are formed today, so ecologists seek to study those plant structures which are changing at the present time, and thus to throw light on the origin of plant structures themselves. 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.