EXPERIMENT STATION BULLETINS. 



627 



Sample. 



Composition. 



A i PureCaHP04 



B I Pure Ca3(P04)2 



C i Raw phosphate rock 



D i 6g. CaHP04+12g. CaSOi. 



E. 

 F. 

 G. 

 H. 



I. . 

 J.. 

 K. 

 L. 



6g. Ca3(P04)2 + 12g. CaS04 



6g. rock +12?. CaS04 



4.5g. CaPH04+1.5g. Ca3(P04)2 +12g. CaS04. 

 3.0g. CaHPO4+3.0g. Ca3(P04)2 + 12g. CaS04. 



1.5g. CaHP04+4.5g. Ca3(P04)2 +12g. CaS04. 



4.5g. CaHP04 + 1.5g. rock+12g. CaS04 



3.0g. CaHPO4+3.0g. rock+12g. CaS04 



1.5g. CaHP04+4.5g. rock+12g. CaS04 



These samples were analyzed in the same manner as were the com- 

 mercial goods using the same four solutions. The filtrates were tested 

 for change in reactions as were those in the previous work. The results 



are given in the following tables: 



TABLE VI. 



TABLE VII. 



