Israel C. Russell
DEPARTMENT OF THE INTERIORUNITED STATES GEOLOGICAL SURVEYGEOLOGIC BRANCHWashington, D. C, February 5, 1892.Prof. John Muir,Martinez, California.My dear Sir:Prof. Ch. Dufour, of the University of Lausanne, Morges, Switzerland, has recently addressed a letter to the Director of the U. S. Geological Survey, asking for information regarding recent changes in the glaciers of America. Prof. Dufour's letter has been referred to me, with request that I assemble all available data bearing on the advance and retreat of the glaciers of this country.As you are more familiar than any one else with the glaciers of the Sierra Nevada, I wish to ask if you will kindly inform me if they have advanced or retreated since you first became acquainted with them. I should like also to obtain similar information concerning the glaciers of Alaska. The more definite this information can be made the better it will be for the purposes in view.Prof. Dufour has published a brochure on the glaciers of Europe in which it is shown that they are now retreating, and wishes especially to learn if a similar charge is taking place in the01552
Washington, D. C.
1892 Feb 5
Original letter dimensions: 26.5 x 20.5 cm.
Reel 07, Image 0448
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