12 



This article is evidently a refuse material of some particular kind ; 

 the large amount of insoluble matter it contains, points in that direc- 

 tion. 



483, 484. GROUND BONES. 



Sent on from Westford, Mass. 



Moisture at 100^ C, 



Total Phosphoric Acid, 



Sol. and Rev. " " 7| cts. per lb., 



Insoluble " '' 5 cts. " 



Nitrogen, 15 cts. " 



Insoluble Matter, 



Valuation per 2000 lbs., 

 The mechanical condition of both samples was much the same ; the 

 valuation above given lias been for this reason the same. The desir- 

 ability of having ground bones sold only by a guaranteed composi- 

 tion finds an additional strong illustration in this case. 



485. MARL. 



Sent on from South Framingham, Mass. 



Per Cent. 



Moisture at 100° C, 12.12 



Phosphoric acid, .35 



Magnesium oxide, .65 



Calcium oxide, 47.11 



Sulphuric acid, trace 



Chlorine, trace 



Insoluble Matter (Before CaL), 7.73 



" (after Cal.), 7.51 



The above material sent on " as a sample of marl," is essentially 

 a carbonate of lime of fine aggregation and of a soft texture ; and 

 for this reason it deserves a recommendation for agricultural purposes 

 whereever an addition of lime will benefit the soil in the interest of 

 the crops raised upon it. 



C. A. GOESSMANN, Director, 



Amherst, Mass. 



The Bulletins of the Experiment Station will he sent free of charge to 

 all parties interested in its work, on application. 



J. E. Williams, Printer, Amlierst, Mass. 



