— V 



d -v 

 ,d c8 



to 



Cd M • 



o :s 



fflOO 



1^^: 



m V ■ < 



. fi^ 2 ■ 

 o „ o w 





Harkasaari, Tanimela, Finland 

 Pakkalanmaki, Tammela, Finland 



TABLE I. 



Re.sults of micrometric measurements made to determine the relative 

 amounts of microcline and albite in certain perthites from Granite Pegmatites; 

 also relative amounts of the potassic and sodic feldspar molecules as calculated 

 from the chemical analyses given in Table II. 



136 



