Transcription:
13 ready to discuss the origin of these planes of cleavage wh make this granite so easily de illegible dable, nor their
full significance with regard to muntain structure in general I will only say here that oftentimes the granite contained between
two of these N 30 E places? is softer than that outside has been de illegible ded leaving vertical walls as determined by
the direction of the cleavage thus giving rise to those narrow slotted canons called Devils slides Devils lanes Devils galeways
etc'. In many places in the higher portions of the Sierras these are slotted canyons which are filled with Snow . This I thought
might prove to be ice or might prove to be living glaciers 14 still engaged in cutting into the mountains like endless
saws. To decide this question on the 23d of August last I set two stakes in the narrow slot glacier of Mt Hoffman marking
their position by sighting across from wall to wall as I did on the McClure glacier, but on visiting them a month afterwards
I found that they had been melted out I was unable to decide any- thing with any considerable degree of accuracy. On the 4th
of Oct last I stretched a small trout line across the glacier fastening both ends in the solid bank, deleted: thus wh at this
place were only 16 feet apart. I set a short inflexible stake in the ice so as just to touch the tigh illegible drawn line,
by wh