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Excerpt from Geological Collections: Dynamical Geology and Petrography This volume is a Guide to the illustrations of Dynamical Geology in the Vestibule and of Petrography, including both Lithology and Petrology, in Room B. Visitors and students are advised to follow the order of the explanatory text, beginning with the Vestibule and completing the study of the geological agencies before passing to the petrographic collections in Room B. A part only of the main floor of this room is devoted to Petrography, sections 24 to 31 and the gallery being reserved, provisionally, for illustrations of the local and New England geology. On entering Room B, the lithologic collection begins on the left hand, in section 1 of the wall-cases, and extends around the room to section 23; while the two central or floor-cases contain the petrologic collection, with the exception of some of the larger illustrations, which are in the table-cases and in the Vestibule. The numbers on the doors of the cases indicate the sections, and, to facilitate reference to the text of the Guide, corresponding numbers have been placed at the head of each page. The numbers printed in small type in the upper left hand corner of the labels, on the specimen tablets, refer to the Society's general written catalogue, which, however, contains no information not already given on the labels or in the following pages. The numbers corresponding to those by which the specimens are designated in the text are printed in larger type on small rectangles of paper which are either attached directly to the tablet or to the label. These numbers are also made more conspicuous in the Guide by being printed in black-faced type. 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 reconstru