Others are obliterated by land-slips, earthquake taluses, etc., but these lake-deaths compared with those resulting from the deliberate and incessant deposition of sediments, may be termed accidental.

Their fate is like that of trees struck by lightning.
The lake-line is of course still rising, its present elevation being about 8000 feet above sea-level; somewhat higher than this toward the southern extremity of the range, lower toward the northern, on account of the difference in time of the withdrawal of the glaciers, due to difference in climate.

Specimens occur here and there considerably below this limit, in basins specially protected from inwashing detritus, or exceptional in size.

These, however, are not sufficiently numerous to make any marked irregularity in the line.

The highest I have yet found lies at an elevation of about 12,000 feet, in a glacier womb, at the foot of one of the highest of the summit peaks, a few miles to the north of Mount Hitter.