292 LOUIS AGASSIZ, 



read a paper, the contents of which have 

 never been fully published, upon the move- 

 ment of glaciers and upon their internal fea- 

 tures, including the laminated structure of the 

 ice, the so-called blue bands, deep down in the 

 mass of the glacier.^ In the succeeding years 

 of their glacial researches together, Guyot took 

 for his share the more special geological prob- 

 lems, the distribution of erratic boulders and 

 of the glacial drift, as connected with the an- 

 cient extension of the glaciers. This led him 

 away from the central station of observation 

 to remoter valleys on the northern and south- 

 ern slopes of the Alps, where he followed the 

 descent of the glacial phenomena to the plains 

 of central Europe on the one side and to those 

 of northern Italy on the other. We therefore 

 seldom hear of him with the band of workers 

 who finally settled on the glacier of the Aar, 

 because his share of the undertaking became 

 a more isolated one. It was nevertheless an 

 integral part of the original scheme, which was 

 carried on connectedly to the end, the results 

 of the work in the different departments being 

 constantly reported and compared. So much 

 was this the case, that the intention of Agas- 



^ See Memoir of Louis Agassiz, by Arnold Guyot, written 

 for the United States National Academy of Sciences, p. 38. 



