Excerpt from Revision of the North American Pocket Mice The Division of Ornithology and Mammalogy is engaged in mapping the geographical distribution of birds and mammals, in addition to the study of their economic relations. The purpose of this work is to as certain the boundaries of the natural faunal areas of North America. The original information on which the maps are based is collected mainly by special field agents employed by the Division; a smaller portion is contributed by voluntary observers. In the progress of the work many new facts are obtained which ought to be put on record for the benefit of other workers in this department of science. It is not unusual to find new species in the collections made by the field agents of the Division, and such species must be named and assigned their proper systematic postion before they can be discussed intelligently. It is evident that the results of the investigations of the Division are of importance to two distinct classes of readers - farmers and natural ists. It is deemed desirable, therefore, to publish such of the results as are of use mainly to those engaged in scientific research separately from those of a more purely economic character. The publication of the economic material being already provided for (and appearing as bulle tins and reports), it has been decided to publish a series of faunal papers, under the title north american fauna. This publication will con tain, in addition to the faunal papers proper, such technical matter as results from the study of the material collected or as may be necessary to an intelligent understanding of the reports which follow. N o attempt will be made to issue the separate numbers at regular intervals, but each number will bear date of actual publication. The present is the first of the series. 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.