Excerpt from Nature, Vol. 13: A Weekly Illustrated Journal of Science; November 1875 to April 1876 The region recommended by Dr. Hayden and approved of by the Government as the scene to which the Operations of the Survey should be transferred was that portion of the Rocky Mountain range which runs through Colorado and New Mexico - a region as yet unsurveyed and likely in a few years to be rapidly developed by some of the most important railroads of the West. The survey of the fortieth parallel by Mr. Clarence King, to which allusion has been already made, and of which some account will be given in a subsequent paper, had done good service in making known the physical features and geology of a belt of country stretching across the northern limits of the tract which Dr. Hayden now proposed to examine. That survey would form the starting-point of the new explorations which it was arranged should sweep west ward across the watershed of the continent to the left bank of the Green and Colorado Rivers, eastward across the sources and higher course of the Platte, Arkansas, and other tributaries of the Mississippi, and southwards to the boundary-line between the United States and Mexico. 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.