









West 



6 



7 



8 



9 



10 



11 12 



21 



22 



20 



19 



18 



17 14 



94 THE FORMS OF WATER IN 



MOTION OF LOWER GRINDELWALD GLACIER. 

 East 

 Stake ..12345 

 Inches . 18 19 20 21 2] 



237. The theodolite was here planted a little below 

 the footway leading to the higher glacier region, and at 

 about a mile above the end of the glacier. The mea- 

 surement was rendered difficult by crevasses. 



238. The largest glacier in Switzerland is the Great 

 Aletsch, to which further reference shall subsequently 

 be made. Across it on August 14, I860, a series of 

 thirty- four stakes was planted by Mr. Hawkins and me. 

 Measured on the 16th and reduced to their daily rate, 

 the velocities were found to be as follows : — 



MOTION OF GREAT ALETSCH GLACIER. 



East 



Stake ..12345 6 7 8 9 10 11 12 



Inches .23468 11 13 14 16 17 17 19 



Stake . . 13 14 15 16 17 18 19 20 21 22 23 



Inches . 19 18 18 17 19 19 19 19 17 17 15 



Stake . . 24' 25 26 27 28 29 30 31 32 33 34 



Inches . 16 17 17 17 17 17 17 17 16 12 12 



West 

 # 



239. The maximum motion here is nineteen inches a 

 day. Probably the eastern side of the glacier is shallow, 

 the retardation of the bed making the motion of the 

 eastern stakes inconsiderable. The width of the glacier 

 here is 9,030 links, or about a mile and a furlong. 

 The theodolite was planted high among the rocks on 

 the western flank of the mountain, about half a mile 

 above the Mar^elin See. 



