SNOW-WAVES AND SNOW-RIPPLES 171 



which gives great transporting power over snow- 

 flakes, which, owing to their slow rate of subsidence, 

 are very readily suspended, but which, as they, 

 lie close and flat, are not much exposed to the 



Fig. 23 

 Longitudinal section of the same. 



direct current of wind as it flows parallel to the 

 surface. The hollow space round the tree has the 

 eddy form both in plan and profile, and corresponds 

 to the space enclosed within the bank of snow 



^^ 



Fig. 24 

 Cross section of the same , lee side. 



which accumulates round the houses on the prairie 

 near Winnipeg. Similarly shaped hollows are kept 

 open where boulders project above the level of 

 loose-lying snow (Figs. 25 and 26). 



