They lean towards the head of the glacier and extend across from side to side in regular order in a direction at right angles to the direction of greatest declivity, the distance between the crests being about two or three feet, and the depth of the troughs between them about three feet.

A more interesting problem than a walk over a glacier thus sculptured and adorned is seldom presented to the mountaineer.
The Lyell Glacier is about a mile wide and less than a mile long, but presents, nevertheless, all the essential characters of large, river-like glaciers--moraines, earth-bands, blue veins, crevasses, etc., while the streams that issue from it are, of course, turbid with rock-mud, showing its grinding action on its bed.

And it is all the more interesting since it is the highest and most enduring remnant of the great Tuolumne Glacier, whose traces are still distinct fifty miles away, and whose influence on the landscape was so profound.

The McClure Glacier, once a tributary of the Lyell, is smaller.

Thirty-eight years ago I set a series of stakes in it to determine its rate of motion.
Towards the end of summer in the middle of the glacier it was only a little over an inch in twenty-four hours.
The trip to Mono from the Soda Springs can be made in a day, but many days may profitably be spent near the shores of the lake, out on its islands and about the volcanoes.
In making the trip down the Big Tuolumne Canyon, animals may be led as far as a small, grassy, forested lake-basin that lies below the crossing of the Virginia Creek trail.