AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES] 
Ar?r. XXIIl.—On the formation of Hail in the — of the 
Yosemite Fall; by Witi1AM H. Brew 
[Substance of a paper read before the x eet Academy of Natural Science, 
April 19th, 1875.] 
THE Yosemite Fall pours into ae valley from the north. It 
is in an open niche or recess of so wide an angle oe the whole 
series of cascades and falls, about ‘a thousand feet more to the 
bed of the valley. 
On the 14th of last April, in company with Mr. Galen Clark, 
the official custodian of the Yosemite valley and well-known 
mountaineer, I visited the foot of this Upper Yosemite Fall and 
observed the phenomena to be described. During our visit of 
four days to the valley, the sky was nearly cloud ch 
morning perfectly so, a few cumuli onl appearing each day at 
about 10 4. M. and disappearing at or before sunset. The air 
was warm, the temperature rising to —_ 70° F. each day, and 
sinking at night to perhaps 50° or | The streams were all 
very high from the melting snow, w. se was abundant on all 
the heights above the valley. 
In the winter a great “ice-cone” forms at the foot of this fall, 
the aqaieralation “of frozen spray. That form 
was much reduced in size by thawing at the time of our visit. 
I then thought it perhaps 100 feet thick. Messrs, Clark and 
Am. Jour. Sct.—Tuirp Serres, Von, X, No. 57. BRET» 1875, 
ll 
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