416 



EDWARD STEIDTMANN 



to magnesium of about 2.6. Twenty-four analyses of well water 

 from dolomites gave an average calcium magnesium ratio of 2.3. 



None of the crystalline terranes from which stream analyses 

 are reported can be regarded as equivalent in composition to an 

 average igneous rock, in which the ratio of calcium to magnesium 

 is about 1 .37 to 1. 



The analyses are of unequal value. Only those of the Chippewa 

 and Wisconsin are based on yearly averages. The calcium ratio 

 of the others may be too high or too low. In the following table, 

 the ratio of calcium to magnesium varies from 2.03 to 4.91. 



TABLE XX 



Table Showing the Calcium Magnesium Ratio in Streams Flowing over 



Crystalline Rocks 



The following calcium magnesium ratios of streams on shales 

 and dolomites are based on yearly averages of daily samples 

 reported by Dole. 



TABLE XXI 



The Calcium Magnesium Ratio in Streams Flowing over Dolomite and Shales 



