816 



GEOLOGICAL SURVEY OF THE TEREITORIES 



The first triangulation was made under more favorable circumstances 

 than the 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,) 9,070 feet. 



Passes and divides. 



, Feet. 



T6ton Pass 8,464 



TyglieePass 7,063 



Water-sbed between Fire-Hole, Snake, and Henry's Fork 8, 761 



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



Higbest point on tbe divide between tbe East Fork of tbe Fire-Hole and Yellow- 

 stone Elvers 8,893 



Continental divide, between tbe Fire-Hole River and Sbosbone Lake 8, 717 



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



Soutbern divide, from bead of Falls River to Snake River 7, 533 



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



and Henry's Fork 8,267 



Divide between Malade River and Marsb 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 : 



a a 



i>cDC50i-ic<(T-((rjcc'!tiC50i>x>oi 



June 



July = 



Aug. 



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The horizontal divisions represent hundredths of an inch of the barometric coh 



