10 



CHEMICAL ANALYSES. 



The comparative manurial value of ground bones depends on a cor- 

 responding chemical composition, and to a considerable degree on 

 a good fine mechanical condition. The relative commercial value of 

 different samples ought to be judged by a due consideration of both 

 circumstances. 



568. REFUSE MATERIAL FROM SOAP WORKS. 



Sent on by Holyoke Soap Works, Holyoke, Mass. 



jPe*' Cent. 



Moisture at 100" C, 19.70 



Total phosphoric acid, 15.37 

 Soluble " '' 0.03 



Reverted " " 5.29 



Insoluble '' " 10.05 



Nitrogen, 4.24 



Insoluble matter, 1.37 



This material is similar to tankage in composition and in mechan- 

 ical condition. 



569. BONE BLACK. 



Sent on]by F. G. Arnold, Swansea, Mass. 



I'er cant. 



Moisture at 100" C, 5.04 



Ash, 67.43 



Phosphoric acid, 16.56 



Insoluble matter, .37 



