1895.] 



PUBLIC DOCUMENT — No. 33. 



293 



Deherain remarks that his experiments make it clear that 

 the leather yields its nitrogen very slowly. He does not 

 state whether the leather used had been steamed, roasted or 

 was untreated. 



Miintz f and Girard, in connection with their experiments 

 on the nitrification of various nitrogen-containing organic 

 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 sand}-, being quite favorable to nitri- 

 fication. The plats were planted with fodder corn during 

 both years. 



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 metrique) = 100 kilograms. 



t Ann. Agron., 17, 289-304; Biedermann's Centralblatt, 20, 656. 



