1895.] 



PUBLIC DOCUMENT — No. 33. 



293 



Deherain remarks that his experiments make it clear that 

 the leather yields its nitrooen very slowly. He does not 

 state whether the leather used had l)eeii steamed, roasted or 

 was untreated. 



Mtintz f and Girard, in connection with their experiments 

 on the nitrification of various nitrooen-containinof orofanic 

 substances, carried out also a series of field experiments 

 with various nitrogenous materials. Each plat had an area 

 of one are and received 1.25 kilos, of nitrogen the first year, 

 together with the necessary quantity of phosphoric acid and 

 potash. No manure was applied the second year. The 

 soil was light and sandy, being quite favorable to nitri- 

 fication. The plats were planted with fodder corn during 

 l)otli vears. 



Fodder Corn grown upon One Are {Dry Matter). 



The above results show that leather, even when roasted, 

 is quite inferior in its action to dried blood and nitrate of 

 soda. 



* Qtm. (quintal metriqiie) = 100 kilograms. 



t Ann. Agron., 17, 289-304; Biedermann's Centralblatt, ao, G.j6. 



