94 The Shoshone Island. 



interior to the dry, cold winds of the conti- 

 nent eastward. 



Yet another of these barrier functions re- 

 mains to be ascribed to the Cascade range. 

 Its uplift along the coast of Alaska made it a 

 barrier to the flow eastward of the Japan cur- 

 rent of the ocean. 



The present extended plains from Alaska 

 to Baffin's bay would warrant the conclusion 

 that before the elevation of the Cascade bar- 

 rier at Alaska, the Japan current must have 

 flowed over those stretches of low country on 

 its way northward. 



The effect of this, as previously noted, 

 would be to sweep away all accumulations of 

 snow and ice in that region; in other words, 

 would prevent accumulations of snow and ice 

 between our island of Shoshone and the Arc- 

 tic circle, a condition of things which would 

 be very effective in modifying the climate of 

 the region we are describing. 



Yet such an inflow of a vast tropical river 

 from the ocean itself must have 'existed till 



