Origin of Lake Tahoe_.

That Lake Tahoe was once wholly occupied by ice, I think, is certain; but that it was scooped out by the Lake Valley glacier is perhaps more doubtful.

All other Sierra lakes which I have seen certainly owe their origin to glacial agency.

Neither do I think we should be staggered by the size or enormous depth of this Lake.

Yet, from its position, it may be a plication-hollow, or a trough produced by the formation of two parallel mountain ridges, and afterward modified by glacial agency, instead of a pure glacial-scooped rock-basin.