EXPERIMENT STATION. 61 



Plastbr. 



894. Plaster; ground by Knickerbocker Piaster Mills, New 

 York; sold by Ruggles & Clark, Shelton, Ct. Sampled by Sta- 

 tion Agent. 



949. Plaster. 



1028. Double Ground Land Plaster. J. B. King & Co., New 

 York. From stock of R. B. Bradley & Co., New Haven. 



849. Nova Scotia Land Plaster, ground by G. W. Miller, Mid- 

 dlefield. 



858. Nova Scotia Land Plaster, ground by V. C. & C. V. 

 King, New York City. 



850. Onondaga Land Plaster, ground by E. B. Alvord & Co., 

 Jamesville, N. Y. 



1029. A. A. Union Ground Plaster, Whitmore Bros., Boston. 

 From stock of J. A. Paine, Danielsonville. 



1030. Nova Scotia Land Plaster, Newburgh Plaster Works, 

 N. Y. From stock of Wilcox & Judd, Bristol. 



1031. Pure Ground Nova Scotia Plaster, John Hurd, Bridge- 

 port. From stock of G. H. Alvord & Co., Winsted. 



949, 849, 858, and 850 were sent by Harvey Elliott, North 

 Guilford, the other samples were taken by Station agents. 



It will be noticed that 894 and 949 consist of burned and un- 

 burned plaster in approximately equal proportions. 



Onondaga Plaster, 850, contains, as usual, over 20 per cent, of 

 carbonates. The Nova Scotia variety is a purer sulphate of lime. 

 1030 has a larger percentage of carbonate than is commonly 

 present in Nova Scotia plaster, 



•V 



A correspondent inquires : 



" 1st. What is the comparative value of Cayuga and Nova 

 Scotia plaster as fertilizers ? 



" 2d. Are the carbonates found in Cayuga plaster of any value 

 in agriculture, and if so, how much ?" 



It was replied in substance : Commercially considered, the plas- 

 ter that gives us the most sulphate of lime for the money is the 

 best, provided the pulverization is equal ; agriculturally the same 

 is true in general. Carbonate of lime sometimes, no doubt, may 

 act well where sulphate of lime would be pronounced useless and 

 in such a case the Cayuga plaster would be better than the Nova 



