its snout four miles out on the level
plain, nearly to the present shores of Lake Tahoe, dropping
its debris on either side and thus forming a bed for itself.
In its subsequent retreat it seems to have rested its
snout some time at the lower end of Fallen Leaf Lake, and
accumulated there an imperfect terminal moraine.

_Cascade Lake Glacier_. Cascade Lake, like Fallen Leaf
Lake, is about one and one-half miles from Lake Tahoe, but,
unlike Fallen Leaf Lake, its discharge creek has considerable
fall, and the lake surface is, therefore, probably 100 feet
above the level of the greater lake. On either side of this
creek, from the very border of Lake Tahoe, runs a moraine
ridge up to the lake, and thence along each side of the lake
up to the rocky points which terminate the true mountain
canyon above the head of the lake. I have never anywhere seen
more perfectly defined moraines. I climbed over the larger
western moraine and found that it is partly merged into the
eastern moraine of Emerald Bay to form a medial at least
300 feet high, and of great breadth. From the surface of the
little lake the curving branches of the main moraine, meeting
below the lake to form a terminal moraine, are very distinct.
At the head of the lake there
is a perpendicular cliff over which the river precipitates
itself, forming a very pretty cascade of 100 feet or more. On
ascending the canyon above the head of the lake, for several
miles, I found, everywhere, over the lip of the precipice,
over the whole floor of the canyon, and up the sides 1000 feet
or more, the most perfect glaciation.

There cannot, therefore, be the slightest doubt that this also
is the pathway of a glacier which once ran into Lake
Tahoe. After coming down its steep rocky bed, this glacier
precipitated itself over the cliff, scooped out the lake at
its foot, and then ran on until it bathed its snout in the
waters of Lake Tahoe, and probably formed icebergs there. In
its subsequent retreat it seems to have dropped more debris in
its path and formed a more perfect terminal moraine than did
Fallen Leaf Glacier.

_Emerald Bay Glacier_. All that I have said of Fallen
Leaf Lake and Cascade Lake apply, almost word for word, to
Emerald Bay. This beautiful bay, almost a lake, has also been
formed by a glacier. It also is