GEOLOGY. 125 
recently been pronounced a myth. This interesting phenomenon 
is nothing more nor less than a mountain stream which, flowing 
down the mountain side, at its base splits quite curiously into two 
distinct streams, one going northerly to the Upper Yellowstone 
River, thence via the Missouri and Mississippi rivers to the Atlantic 
waters ; the other, flowing southerly, reaching the Pacific ocean by 
way of Snake River and the Columbia. 
But the greatest geographical result, as well as the most im- 
portant for other reasons, was the discovery of a pass through the 
Wind River range of mountains, at its northern limit, which ren- 
ders the park accessible from the head of Wind River. This was 
one of the main objects of the expedition, the “impossibility” of 
jts forerunners. 
While it is impossible to give, in detail, the work of the several 
departments, it may be said that all was accomplished in the most 
thorough manner, as the reports will’show when completed. In 
geology, the collections comprise specimens from all of the western » 
_ formations, from the metamorphic rocks to the most recent, in- 
cluding material of volcanic origin and from the drift, as well as 
geyser and hot spring deposits in quantity. Many of the recent 
products are fully as interesting as those of an older date, and the 
` surface and dynamical geology of this region present a vast field 
for study. ans a = 
I have dwelt upon the geology, becatise more specially interested 
in that subject, but the botanical and other results are no less in- 
teresting. No zoölogist accompanied the expedition to collect, 
but Mr. J. D. Putnam, assistant to Dr. Parry, obtained a number 
of insects besides attending to his regular duties. I also noted 
the larger and more common animals which I observed from time 
to time. Dr. Heisman, surgeon to the expedition, collected speci- 
mens of the water and many of the deposits of the springs and 
geysers, for analysis. / i 
For a more extended account of these explorations I must refer ` 
to the articles before mentioned. — Turo. B. Comstock, Geologist. 
-~ Mowxeys IN THE AMERICAN Mrocens.— Prof. Cope, while inves- 
-~ tigating the paleontology of Colorado in connection with Hayden’s 
“geological survey of the territories during the past season, 
detected the remains of what he states to be a quadrumanous mani- 
mal allied to the lemurs. It has been named Menotherium lemur- 
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