34 Composition and Value of Phosphatic Manures. 



c. Bone Shavings. 



Bone-shavings are produced in button-works, manufactories 

 of knife-handles, &c., &c. Being the turnings of hard bones 

 they contain rather more phosphate of lime and a little less 

 organic matter or nitrogen than ordinary bone-dust. 



Composition of Bone Shavings. 



Moisture 13-12 



"Organic matter .. , 26'12 



Phosphates of lime and magnesia .. .... 53-74 



Carbonate of lime . . 5*39 



Alkaline salts '78 



Sand .. .. ... .. .. -85 



100-00* 



* Containing nitrogen 3*28 



Equal to ammonia . . . . 3'98 



Purchasers of this valuable refuse should be on their guard, 

 for it is frequently mixed with vegetable ivory a substance which 

 has no appreciable value as a manure, and which resembles so 

 closely bone shavings that the admixture cannot be recognised 

 by simple inspection. 



