1886.] 



PUBLIC DOCUMENT — No. 33. 



109 



Plaster. 



[I. Ground Nova Scotia plaster. Collected of B. F. Bridges, South Deerfield, Mass. 



Sold at $7.50 per ton.] 

 [II. Onondaga plaster. Collected of B. F. Bridges, South Deerfield, Mass Sold at 



$6 per ton.] 



Moisture at 100° C 

 Calcium oxide, 

 Magnesium oxide, 

 Sulphuric acid, 

 Carbonic acid, 

 losoluble matter, 



Cayuga Land Plaster. 



[Sent on for examination.] 



Per cent. 

 11.56 

 29.35 

 4.76 

 32.76 

 7.20 

 1 2.00 



Sold at $6 per ton. 

 Bonehlack Waste. 



[I. Sent on by Bolton Farmers' and Mechanics' Association, Bolton, Mass.] 

 [II. Sent on for examination from Concord, Mass.] 



Allowing four cents per pound of phosphoric acid for 

 boueblack of a fine mechanical condition, Sample I. repre- 

 sents a value of from $23 to $24, and Sample II. of from 



