EXPERIMENT STATION BULLETINS, 



313 



TABLE 17. — Rale and extent of soluhility of powdered hiotite granite which was first treated with salt 

 solutions and then washed until all soluble salts were eliminated. Ratio of powdered rock to distillled 

 water was about 1 to 0.75 and mixture maintairied at room temperature. Figures represent freezing 

 point depression. 



TABLE 18. — Rate and extent of solubilitij of powdered gneiss which u'as treated will salt solutions and then 

 washed until all the readily soluble salts were eliminated. Ratio of poivdered rock to distilled water 

 was about 1 to 0.75 and mixture maintained at room temperature. Figures represent freezing point 

 depression. 



Days. 



Ca(N03)2.. 

 NaNOs.... 



KNO3 



KCl 



(NH4)2S04. 



NaCl 



K2SO, 



CaH4(P04)2 

 KH2PO4... 



NaC2H302. 

 Check 



91. 



C°. 

 .012 



.014 



.015 



.014 



.017 



.013 



.015 



.010 



.012 



.019 



.010 



