GEOLOGICAL SURVEY OF THE TEERITOEIES. 165 



said park, and their retention in their natural condition. The Secretary 

 may, in his discretion, grant leases for building purposes for terms not 

 exceeding ten years, of small parcels of ground, at such i^laces in said 

 park as shall require the erection of buildiDgs for the accommodation of 

 visitors ; all of the proceeds of said leases, and all other revenues that 

 may be derived from any source connected with said i3ark, to be ex- 

 pended under his direction in the management of the same, and the 

 construction of roads and bridle-paths therein. He shall provide against 

 the wanton destruction of the fish and game found within said park, 

 and against their capture or destruction for the purposes of merchandise 

 or profit. He shall also cause all persons trespassing upon the same 

 after the passage of this act to be removed therefrom, and generally 

 shall be authorized to take all such measures as shall be necessary or 

 proper to fully carry out the objects and purposes of this act. 

 Approved March 1, 1872. 



CHAPTER XL 



report of a. c. peale, m. d., on minerals, rocks, thermal 



springs, &c. 



Washington, D. C. 



Dear Sir : I have the honor to transmit herewith my preliminary 

 report on the minerals, rocks, and thermal springs met with during 

 the explorations of this summer. 



I commence at Ogden, Utaii Territory, our starting-point, and describe 

 the minerals, rocks, and springs encountered by the expedition through- 

 out the whole trip. To study the mineral resources of a country to the 

 best advantage requires that we should have an abundance of time to 

 devote to each locality, working on our knees, as it were, with drill and 

 hammer. As the greater part of our time was sj)ent on the march, such 

 a course was impracticable ; 1 therefore confined myself to the collec- 

 tion and general investigation of specimens- 

 Six hundred and twenty-seven specimens of rocks, with over one 

 thousand specimens of minerals, including those from the hot springs, 

 have been deposited in the Smithsonian Institution. Catalogues of the 

 minerals and rocks are appended to this report. 



I insert qualitative analyses of the waters of the principal geysers 

 and hot springs. In so doing, I feel a hesitancy, for the field is so vast 

 that to develop it thoroughly would require the work of years, and the 

 number I present is but as a drop of water in the ocean. 



I had hoped to embody in this report a larger number of quantitative 

 analyses, but the time has been limited, and there have been interrup- 

 tions that have rendered it impossible. 



I append a catalogue of the hot springs of which the temperatures 

 were recorded, giving their position, elevation, character, principal con- 

 stituents, highest, lowest, and average temijeratures, together with the 

 temperature of the air at the time of observation. 



In regard to mining operations, I have not attemjited to make any 

 report. We passed through but a small portion of the mining districts, 

 so that any such report would be incomplete. 



In conclusion, I wish to express my thanks to the members of the ex- 

 pedition for their assistance and co-operation, and also to Judge Lovell, 

 of Virginia City, Montana Territory, and C. T. Deuel, esq., of Evanston, 



