1875.] 



407 



[ Frazer. 



CHEMICAL UNITS. 



Si. 

 P. 



0.014 



0.011 



Supposing the basic radicals in excess to replace those deficient, there 

 are wanting 0.062 (^ 0.28 p. c), and of the acid radicals 0.003 units 

 (= 0.018 p c.) to fulfil theoretical requirements. 



Or, to throw this into a rough practical form susceptible of easy com- 

 parison : 



Double Equivalent of Constituents 

 of West Rock. 



1 molecule Labradorite. 

 1 " Augite. 



1 molecule Labradorite. 

 1 ' ' Augite. 



1 molecule Labradorite. 

 1 " Augite. 



