292 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Results per Hectare. 



While the leather has shown its effect, it runs far behind 

 the nitrate of soda. Petermann says that from a financial 

 stand-point the leather shows a loss and the nitrate of soda a 

 gain. Of his results the experimenter makes the following 

 resume : " With horse bean the leather shows practically no 

 influence the first year ; with oats and sugar beets an increase 

 is noted, but this is slight when compared with that from 

 blood and nitrate of soda." In a later publication Peter- 

 iwinn says that in his experiments from 1880 to 1885 the 

 various forms of nitrogen have shown the following relative 

 worth: 1, nitrate of soda; 2, blood; 3, dissolved wool; 4, 

 ground bone; 5, raw wool; 6, leather. 



Deherain * gives the results of the following experiments 

 conducted in the field at Grignon with ground leather. The 

 results with wheat in 1880 and 1881 show the residual effect 

 of the leather applied to potatoes in 1879 : — 



* Chimie Agricole (1892), 619. 



