MEMORIAL OF ARNOLD HAGUE 39 



War Department to provide the expedition with a cavalry escort of 25 

 men, and occasionally a soldier accompanied the geologist into the moun- 

 tains. The area to be surveyed was a belt of country 100 miles wide, 

 extending from the California State line eastward to the Great Plains of 

 Wyoming and Colorado, east of the Eocky Mountains, embracing the 

 line of the first transcontinental railroad. The work of the survey began 

 at the western edge of the great sagebrush desert, in the region of Pyramid 

 and Winnemucca lakes, and extended through parts of Nevada, Idaho, 

 and Utah, across the Eocky Mountains, although in the published report 

 the region is described from east westward. 



The season of 1867 was spent in the Humboldt country, in western 

 Nevada; that of 1868 was occupied v^ith the remainder of the Great 

 Basin as far as the western edge of the Salt Lake desert. The third field 

 season, in 1869, was devoted to the mountains and valleys of the Salt 

 Lake region and the Wasatch Mountains to the east of it. During the 

 three following seasons the exploration covered the Mesozoic and Tertiary 

 areas of Utah and Wyoming, the Laramie plains, the northern extension 

 of the Front Eange, and the eastern slopes of the mountains. In addi- 

 tion to the survey of the area of the Fortieth Parallel, Hague explored 

 Mount Hood, while King investigated Mount Shasta, and Emmons, 

 Mount Eainier, each studying the glacial phenomena and collecting 

 volcanic rocks. 



The winter of 1867-1868 was spent in Virginia City, Nevada, studying 

 the Comstock Lode and the geology of the adjacent country situated just 

 south of the belt of the Fortieth Parallel Survey. In Volume III of the 

 published reports, entitled "Mining Industry," Hague contributed a 

 chapter on the "Chemistry of the Washoe Process," which included a 

 description of the mineralogical character of the ore, the chemical action 

 of mercury and other reagents, and pan experiments. The latter were 

 conducted at the Sheffield Laboratory of Yale College, with the assistance 

 of Mr. Ellsworth Daggett. Hague also wrote a chapter on the geology 

 of the White Pine district. Successive winters were spent in San Fran- 

 cisco, Washington, and New Haven. After the completion of field-work, 

 in 1872, the offices of the Survey w^re located in New York City, where 

 the report and accompanying atlases were prepared. The collection of 

 rock specimens was deposited with the American Museum of Natural 

 History for safekeeping. 



In 1874 Emmons was sent to Europe to study the methods of Euro- 

 pean geological surveys and to obtain the best and latest geological litera- 

 ture. He was also instructed to confer with Professor Zirkel, who had 

 just published his book on microscopical petrography, in 1873, and "to 



