Experiment Station Ueport. 



97 



(2. Collected of E. T. Sabln, East Amberst, 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.) 



Moisture, at 100^^ C, 



Ammonia (equivalent to nitrogen 20.4), 

 Suljjhuric acid, ........ 



Insoluble matter, 



Valuation per two thousand pounds, $106.08. 



Per cent. 



0.23 



24.80 



61.60 



0.05 



Peruvian Oiiayio. 

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



Moistm-e, 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 jiounds, $51.66. 



Per cent. 



14.00 



20.60 



3.10 



1.55 



15.95 



1.14 



1.40 



3.04 



Tankage. 

 (Sent from Chicago, 111.) 



Moisture, at 100° C, 

 Total phosphoric acid. 

 Soluble phosphoric acid, 



Per cent, 

 6.10 

 12.32 

 0.27 



