[Jeanne C.] Carr
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 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
1872 Oct 8
Original letter dimensions: 20.5 x 25.5 cm.
Reel 02, Image 0955
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