EXPEEIMENTS ON TURNIPS. 



323 



Analysis of Ground Mineral Phosphate. 



The ground mineral of 1882 was sold as French high class 

 phosphates. That used in 1883 was an oolitic phosphate, and 

 said to be a true coprolite or dung stone. 75 per cent, passed 

 through Xo. 90 wirecloth. 



Analysis of Superphosphate. 



Soluble; phosphoric acid, . 

 = Tricah:ic ])ii(tsi>hutt' made soluble, 

 Reduced phosplioric acid, . 

 = TricaIcic phosphate made soluble, ) 

 but l>c'C()inc ins(duble, . . . ) 



Phi)spliate.s unacted on by acids, 

 ToUil ])hosph()ric acid, 

 = Trioalcic phosj)hate, 



1882. 



1 1 -34 



1-64 



12-98 



24-75 



3-59 



none 



28 34 



1883. 



11-95 



105 



1300 



26-09 



2-30 

 none 



28-39 



