262 FRAGMENTS OF SCIENCE 



As in all other measurements of this kind, the retarding 

 influence of the sides of the glacier is manifest: the centre 

 moves with the greatest velocity. 



Morteratsch Glacier, Line B 



No. of Stake Hourly Motion 



1 0-05 inch 



2 0-14 " 



3 0-24 " 



4 .... 0-32 " 



5 0-41 " 



6 0-44 " 



7 0-44 " 



8 0-45 " 



9 0-43 " 



10 0-44 " 



11 0-44 " 



The first stake of this line was quite close to the edge 

 of the glacier, and the ice was thin at the place, hence its 

 slow motion. Crevasses prevented us from carrying the 

 line sufficiently far across to render the retardation of the 

 further side of the glacier fully evident. 



Morteratsch Glacier, Line C 



No. of Stake Hourly Motion 



1 0-05 inch 



2 0-09 " 



3 0-18 " 



4 0-20 " 



5 0-25 " 



6 0-27 " 



7 0-27 " 



8 0-30 " 



9 0-21 " 



10 0-20 " 



11 0-16 " 



Comparing the three lines together, it will be observed 

 that the velocity diminishes as we descend the glacier. In 



