816 



GEOLOGICAL SURVEY OF THE TERRITORIES 



The first triaugulation was made under more favorable circumstances 

 than tlie others, and I give it a double weight; ; and adopt, therefore, as 

 the elevation of Mount Hayden above the sea, 13,833 feet. 



The result from an aneroid reading was 13,784 feet. 



Mount Moran, (elevation determined by triangulation,) 12,809 feet^ 



Sawtelle's Peak, (measured in same way,) 0,070 feet. 



Passes and divides. 



Feet. 



T6ton Pass 8,4(54 



Ty<-liee Puss 7,063 



Water-shed betweeu Fire-Hole, Snake, aud Henry's Fork 8,761 



Continental water-sbed, between Yellowstone aud Lewis Lakes 8, 024 



Highest point on the divide betweeu the East Fork of the Fire-Hole and Yellow- 

 stone Rivers 8,893 



Continental divide, between the Fire-Hole River and Shoshone Lake 8, 717 



Eastern divide, from head of Falls River to Snake River 7, 594 



Southern divide, from bead of Falls River to Snake River T, 533 



Continental divide, between the Fire-Hole, west of the Lower Geyser Basin 



aud Henry's Fork 8,267 



Divide betweeu Malade River and Marsh Creek 5, 651 



From the hourly barometric observations at Fort Hall I have con- 

 structed the following mean monthly curves of horary oscillations from 

 7 a. m. to 9 p. m., for the months of June, July, August, and September : 



s a 



Juiif 



July 



Auoi. 



Sept. 





The horizontal divisions represent hundredths of au inch of the barometric column. 



