1873.] 259 [Clarke. 
scientific world by myself, and subsequently substantiated by the 
accounts of a similar discovery by Prof. Whitney. 
This is to certify that the foregoing statements made to C. F. Win- 
slow, M.D., were taken from my mouth and written by him in my 
presence, and I affirm to their correctness in every particular. 
D. B. AKEY. 
Bear Gulch, W. T. eee NS, IS, 
Witnesses : 
- Joun H. OSBORNE. 
ABRAHAM HANER. 
January 15, 1873. 
The President in the chair. Twenty-four persons present. 
The Rev. R. C. Waterston read a letter from Galen Clarke, 
Hsq., giving an account of some explorations in the region of 
the Yosemite Valley. 
I have made two excursions up into the high Sierras this past sum- 
mer. One of the trips was up into the Mt. Lyell group. It is in 
this group of mountains that the Merced has its rise, and flows down 
through the Yosemite Valley. The Tuolumne and the San Joaquin 
Rivers also rise here at the foot of Mt. Lyell, also some small rivers 
which run east into Mono Lake and Owen’s River. I went with Mr. 
John Muir, of Yosemite, for the purpose of examining the great 
snow fields in that group, and to ascertain if there were still any 
evidences of living glaciers there. 
From the observations which we made and the local tests which 
we applied, we are positive that there are several glaciers in that 
group which are in constant slow motion. We drove a line of stakes 
across, and found that they had moved, a month after. Their leneth 
may average about a mile, and their width, perhaps, half as much. 
Their depth is uncertain, but from appearances it must be several 
hundred feet. 
Mr. Muir has spent much time during the past three years in ex- 
ploring the mountains adjacent to the Yosemite, and in studying the 
forms of the cafions, and mountain formations, and the great agency 
which the glaciers have had in giving them their present shape. 
