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the soil. According to Payen, blood perfectly 

 dried, contains 17 per cent, of nitrogen; when 

 prepared upon a large scale, it has 14.87 per 

 cent, of nitrogen, and costs two dollars per 

 one hundred pounds. 



Bone. Bones, when freed of greasy mat- 

 ter and crushed between grooved iron rollers, 

 are well fitted for agricultural use. In Eng- 

 land, their consumption is so large that com- 

 panies have been formed for their importation 

 from foreign lands. If the grease is not care- 

 fully removed by boiling, the fat reacts upon 

 the carbonate of lime of the bony net work, 

 forming a soap of lime which resists all at- 

 mospheric influences; and hence an impedi- 

 ment to the fertilizing influence of the bones, 

 especially when they are not finely powdered. 

 Payen has shown, that old whole bones 

 lost, after having been in the earth for 

 four years, but 0.18 of their weight, whereas, 

 when previously boiled, they lose, under the 

 same circumstances, 0.25 to 0.30. But fresh 

 bone-dust, in a dry state, contains 7.58 per ct. 

 of nitrogen. As found in commerce, it con- 

 tains 0.30 water, and 5.30 nitrogen, and sells 

 for ^1 per 100 pounds. 



