102 PRACTICAL FARM CHEMISTRY. 



Horn and hoof shavings and waste are exceed- 

 ingly rich in nitrogen, but this is in a less soluble 

 or available condition, and I think, rated pretty- 

 high even at eight cents per pound. 



^wolywl^e^ ^^^ material contains from fourteen 

 to fifteen per cent nitrogen, and one 

 or two per cent phosphoric acid. Its fertilizing 

 value is about twenty-five dollars per ton. 



Wool waste from woolen mills varies greatly in 

 its percentage of nitrogen, some samples having as 

 high as fifteen or sixteen, while others have only 

 six or seven per cent. 



Another valuable source of nitrogen is swamp 

 muck, and while available to an unlimited extent 

 on many farms it is seldom appreciated as fully as 

 it deserves. Its nitrogen is not immediately avail- 

 able, but can be made so by composting, and will 

 then be worth as much as that contained in stable 

 manure. This subject will be more fully treated in 

 Nineteenth Chapter. It is of sufficient importance 

 to be urged upon the farmers' attention persistently 

 and forcibly. 



Clover and other leguminosse as means of gather- 

 ing nitrogen from the atmosphere have already been 

 mentioned. 



