238 /. H. OGILVIE 



The Lassenoses and Yellowstonoses contain small amounts of gold, 

 copper, antimony, lead, and bismuth. 



A consideration of the serial chemical characters of the region 



brings out the fact that soda is practically constant and alumina nearly 



so. As silica decreases iron and magnesia increase but very slightly, 



and somewhat irregularly; on the other hand the increase in lime 



is regular and normal. Potash varies from 0.39 to 4.78, and its 



variations bear no definite relation to the decrease in silica, nor does 



the sum of the alkalies uniformly change. The sum of the alkalies 



invariably either equals or exceeds salic lime, which finds expression 



in the rang. 



Department of Geology 

 Columbia University 



