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Excerpt from Descriptive Catalogue of a Petrographic Collection of American Rocks N the following pages Mr. Clark has made a contribution of great value to teachers of Petrography. Many a teacher who has only a limited time allotted for the science has been puzzled to select a properly balanced series of rocks for study. Even when such a series has been chosen, he has met a new difficulty in finding concise descriptions and in many instances the particular specimens available for illustra tion are found to vary widely from the published descriptions of the rocks most nearly like his specimens. To overcome these difficulties Mr. Clark has enlisted the cooperation of Ward's Natural Science Establishment and the exact rocks described herein as well as microscope slides of thin sections from them can be secured from this establishment. 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.

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