VALUATION OF FERTILIZERS, ETC. 455 



Crude Kieserite. 



[Of Randall Fcrlilizer Co., Bos 

 Moisture at 100 C, 

 Magnesium oxide, 

 Calcium oxide, . 

 Sulphuric acid, . 

 Insoluble matter, 



on, Mass. Sent on by C. P. Preston, Danvers, Mass ] 



28.12 

 17.45 



3.13 

 36.87 



3.62 



The sample containod 48. G per cent, of sulphate of mag- 

 nesia, from 7 to 8 per cent, of gypsum, and 2.23 per cent, 

 of chloride of magnesium ; it is consequently of fair quality. 

 The kieserite, as an absorber of ammonia, may profitably be 

 used in many instances as a substitute for gypsum. 



Nova Scotia Plaster (Gypsum). 

 [Collected of R. T. Prentiss, Holyoke, Mass.] 



Calcium oxide, . 

 Magnesium oxide, 

 Sulphuric acid, . 

 Insoluble matter, 



Pounds 

 per Hundred. 



32.17 



1.40 



44.00 



.70 



The sample contains 94.8 per cent, of gypsum, and is a 

 fair article. The customary market price in our vicinity is 

 $0 per ton. 



Onondaga Plaster (Gypsum). 



[Collected of Sheldon & Newcomb, Greenfield, Mass.] 



Calcium oxide, . 

 Magnesium oxide. 

 Sulphuric acid. 

 Insoluble matter, 



rounds 

 per Hundred. 



29.15 

 3.89 



3182 

 9.25 



This article sells at $6 per ton ; its cost corresponds wel! 

 with its percentage of gypsum, — 67 to G8 per cent. 



Onondaga Plaster. 



[Collected of H. D. Fearing, Amherst, Mass.] 



Moisture, . 

 Calcium oxide, . 

 Magnesium oxide. 

 Sulphuric acid, . 

 Carbonic acid, . 

 Insoluble matter, 



Per cent. 

 22.25 

 29.80 



4.32 

 31.58 



8.80 

 10.70 



This sample contains a considerable amount of carbonate 



