EXPERIMENT STATION REPORT. 



353 



(2. Collected of E. T. Sabin, East Amherst, Mass.) 



This form of "German Potash Salts" has thus far 

 proved a very reliable source of potassa for general agricul- 

 tural purposes ; an extensive application has caused, of 

 late, some advance in its cost, as compared with previous 

 years. 



Ammonium Sulphate. 



(Collected of Geo. P. Smith, Sunderland, Mass.) 



Per cent. 



Moisture, at lOO'^ C, 0.23 



Ammonia (equivalent to nitrogen 20.4), . . . 24.80 



Sulphuric acid, 61.60 



Insoluble matter, 0.05 



Valuation per two thousand pounds, $100.08. 



Peruvian Gtiano. 

 (Collected of D. A. Horton, Northampton, Mass.) 



Moisture, at 100° C, 

 Total phosphoric acid, 

 Soluble phosphoric acid, . 

 Reverted phosphoric acid, 

 Insoluble phosphoric acid, 

 Potassium oxide. 

 Nitrogen in organic matter, 

 Nitrogen in ammonia salts. 



Valuation per two thousand pounds, $51.66. 



Per cent. 



14.00 



20.60 



3.10 



1.55 



15.95 



1.14 



1.40 



3.04 



Tajikage. 



(Sent from Chicago, 111.) 



Per cent. 



Moisture, at 100° C, 6.10 



Total phosphoric acid, 12.32 



Soluble phosphoric acid, 0.27 



