although I was myself fully satisfied concerning the real nature of these ice-masses. I found that my friends regarded my deductions and statements with distrust, therefore I determined to collect proofs of the common measured arithmetical kind.
On the 21st of Aug. last I planted five stakes in the glacier of Mt. McClure, which is situated east of Yosemite Valley, near the summit of the range. Four of these stakes were extended across the middle of the glacier. The first stake was planted about 25 yds. from the east bank of the glacier. The second 94 yards, the third 152, and the fourth 223 yards. The positions of these stakes were determined by sighting across from bank to bank past a plumbline made of a stone and a black horsehair.
On observing my stakes on the 6th of Oct., or in 46 days after being planted, I found that stake No. 1 had been carried down stream 11 inches; No. 2, 18 inches; No. 3, 34; No. 4, 47 inches. As stake No. 4 was near the middle of the glacier, perhaps it was not far from the point of maximum velocity, 47 inches in 46 days, or 1 inch per day. Stake No. 5 was planted about midway between the head of the glacier and stake No. [ ]. Its motion I found to be in 46 days 40 inches.
Thus these ice-masses are seen to possess the true glacial motion. Their surfaces are striped with bent dirt bands. Their surfaces are bulged and undulated by inequalities in the bottom of their basins, causing an upward and downward swedging corresponding to the horizontal swedging as indicated by the curved dirt bands.
The McClure Glacier is about half a mile in length and about the same in width at the broadest place. It is crevassed on the southeast corner. The crevass runs about southwest and northeast and is several hundred yards in length. Its width is nowhere more than one foot.
The Mt. Lyell Glacier, separated from that of McClure by a narrow crest, is about a mile in width by a mile in length.
I have planted stakes in the glacier of Red Mountains also but have not yet observed them.
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In going up any of the principal Yosemite streams, lakes in all stages of decay are found in great abundance, regularly becoming younger until we reach the almost countless gems of the summits with scarce an inch of carex upon their shallow, sandy borders and with their bottoms still bright with the polish of ice. Upon the Nevada and its branches there are not fewer than a hundred of these glacial lakes from a mile to a hundred yards in diameter with countless glistening pondlets not much larger than moons.