Excerpt from Publication of Field Museum of Natural History, Vol. 10: Anthropological SeriesThe generosity of Mrs. T. B. Blackstone in contributing a fund toward the printing of this volume is gratefully acknowledged.I have to thank Dr. 0. C. Farrington, Curator of Geology, for the mineralogical definitions of many specimens, and Mr. H. W. Nichols, Assistant Curator of Geology, for manifold advice on technical ques tions.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.