. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ley of the Red river 86 B. —Preliminary report on the natural history, by Spencer F. Baird M C. —Report on the specimens of soils and mineral waters, by Jas. C. Booth 96 iv CONTENTS. Page. D. —Note, on the geological report 98 E. —Table of camping places along the direct line of survey - 98 F. —Tables of meteorological observations 100 G. —Table of latitudes, longitudes, and magnetic declinations 104 H. —Table showing the altitudes of st
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . ley of the Red river 86 B. —Preliminary report on the natural history, by Spencer F. Baird M C. —Report on the specimens of soils and mineral waters, by Jas. C. Booth 96 iv CONTENTS. Page. D. —Note, on the geological report 98 E. —Table of camping places along the direct line of survey - 98 F. —Tables of meteorological observations 100 G. —Table of latitudes, longitudes, and magnetic declinations 104 H. —Table showing the altitudes of stations above the sea-level 105 I. —Observations for determining profile from El Paso to Preston, on Red river 108 J.—Observations for determining the profile from the Emigrant Crossing of the Pecos to the Big Springs of the Colorado. Ill K.—Observations for determining the profile through San Augustine Pass of the Organ mountains Ill L.—Tables of astronomical observations - — 112 BOTANY. Report on the botanical collection, by Dr. John Torrey and Prof. Asa Gray 157 GEOLOGY. Report on the geology of the route, by William P. REPORT. CHAPTER I. Methods pursued in determining the Data upon which are based the Maps and Reports of the Survey. To enable the department to judge advisedly of the amount of confidence due to the resultsof an exploration of this character, it would seem proper to set forth the organization of theexploring party, and to describe in full the instruments used and the methods pursued indetermining the data upon which these results are based. As the object of this exploration was eminently practical in its character, and had in viewthe investigation of a specific question, I have thought it advisable, in determining upon a planfor the report, to give the prominent place to the practical results which have a direct bearingupon the construction of the railroad, and to set them forth under proper heads, as briefly asis consistent wit
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