igio.] 



INLAND-ICE OF THE ARCTIC REGIONS. 



115 



different manner and protect the ice beneath them from the sun 

 (note margins of wells and basins in Fig. 35, a and b). The same 

 effect is brought about if the fragments are too large, for the thick- 



I c 



Fig. 35. Diagrams to show the effects of differential mehing on the ice 

 surface: a, dust wells; b, basins; c, glacier stars; d, bagnoires. 



ness of surface layer of rock which can be sensibly warmed by the 

 sun's rays is quite independent of the size of the fragment. Thus 



■M^wx = LAyer wormed by ^un. 



Fig. ^6. Fragments of rock of different sizes to show their effect upon 

 meltins: on the ice surface. 



the familiar ice tables developed especially upon mountain glaciers 

 are formed. Fig. 36 brings this out by showing the relation of the 



