70 Scientific Intelligence. 
ice, and, comparing the form of the basin which it occupied with 
similar adjacent basins that were empty, I was led to the opinion 
that this glacier was several hundred feet in dept 
Then I went to the “snow-banks” of Mts. Lyell and pent 
and, on examination, was convinced that they also were true gla- 
ae and that a dozen other snow-banks seen from the summit of 
t. Lyell, crouching in shadow, were glaciers, living as any in the 
world, and busily engaged in completing that vast work of moun- 
tain-making accomplishe their giant relations now dead, 
cairo united and continuous, covered all the range from summit 
Y Bet although I was myself thus fully satisfied concerning the 
real nature of these ice masses, I found that my friends regarded 
my deductions and statements with distrust ; therefore I deter- 
mined to collect proofs of the common, measured, arithmetical 
ind. 
On the twenty-first of August last, I planted five stakes in the 
glacier of Mt. McClure, which is situated east of Yosemite Valley, 
near the summit of the 1 range. Four of these stakes were extended 
—— the glacier, in a straight line, from the east side to a point 
ear the middle of the glacier. The first stake was planted about 
wenty-five yards from the east bank of the glacier; pa second, 
ninety four yards; the third, 152, and the fourth, 225 yards. The 
oni s of these stakes were determined by sighting across from 
k to bank, past a plumb-line, made of a stone and a black 
horse-hair. 
On observing my stakes on the sixth of October, or in forty-six 
ie after being planted, I found that stake No. 1, had been car- 
rie d dow wh stream — inches ; No. 2, eighteen "inches; No. 3, 
ke WwW 
near the middle of the ackai: perhaps it was not far from the 
between the head of the glacier and stake N o. 4. Its motion I 
found to be, in fk pos days, forty inches. Thus these a earmips 
ati :s the bottom of their basins, causing an upward and 
downward swegding, co gg tae o the horizontals wedging as 
indicated by the served dirt-ban 
e Mt. Me Clure glacier is abot one-half of a mile in length, 
and the same in width at the broadest place. It is crevassed on 
the south-east corner. The crevasse runs ubout south-west and 
north-east, and is several hundred yards in length. It is nowhere 
more than one foot in width. 
The Mt. — slicer, separated from that of McClure by a 
narrow crest, is about a mile in length. I have planted stakes in 
ee glaciers of “Red Mane ” also, but have not yet observed 
em 
The Sierras adjacent to the Yosemite Valley are composed of 
slate and granite, set on edge at right angles to the direction of 
