Geology and Natural History. 315 
of a few miles, four such remarkable gree. eat the Pacific 
es the Atlantic slopes. There is not the slightest obstruction 
railroad over either of these eitnek migrants are already 
following our track of exploration, and hoe Soke ten fon 
very numerous, and their vale in the location of i Sedpoireait points, 
as well as correcting the old one a has abr: reat. The Tetons 
found to be within © 
All 
tion is paid to all results of a practical character on the principle 
that the money that enables us to make t se explorations comes 
om the people, and should acl = far ai possible to them in a 
sha re will be avedlabie to 
e party under Mr. eveniiee ‘s now on its way down the 
east side of the Snake River valley, having carefully surveyed the 
Sources of that river: every branch will be carefully locate The 
party will reach Fort Hall about the 13th of October. It will 
then survey a parallel belt to Salt Lake City, thus connecting all 
our work in the northwest with the Pacific railroad. The party 
under my charge will complete the survey of the Madison river 
and its branches, then the Gallatin to its sources, then pass over 
moi mountains into the valley of the Yellowstone, down to the 
thal? g to the mouth of Shields river, then to the three 
forks of the Missouri, and then down that river to Helena, where 
our labors will probably close about the Ist of November. 
latitude and longitude of Fort Ellis has been quite pone fixed 
Y an extended series of observations by Mr. Gan with a 
transit, — similar observations will be made at Virainia City 
and Helen 
- Besides the two large parties mentioned above, there have been 
a number of smaller ones operati ng in various portions of the 
West, under the auspices of this survey. Prof. Cyrus Thomas 
spent t the season in the northwest collecting agricultural —— 
and all other information of a service character, s bee 
ae aes visit Dakota and ota, and to push his : ai en 
rthward into the Red River country as possible. e 
public ae — for a continuation of his agricultural reports, as 
ell as n insects, and other subj 
f. PD Cope, one of our most disti nguished scientists, fitted 
Sut quite an extensive party at Fort Bridger at the expense of the 
