290 AGRICULTUKAL EXPERIMENT STATION. [Jan. 



10.93 per cent, sugar. Petermann remarks on these results 

 as follows: "In spite of the increased yield obtained by 

 using the leather, the experiment was not a success finan- 

 cially, and, further, the beets produced ^vith the aid of the 

 leather were poorer in quality than those without it." 



In 1880 Petermann * carried out a series of experiments 

 with ground steamed leather, to test its manurial value. It 

 was very dry and brittle, and containexl 7.51 per cent, of 

 nitrogen and 0.81 per cent, of phosphoric anhydride soluble 

 in hydrochloric acid. 



The experiments were carried on in the plant house in 

 pots, with oats ; in the garden, with the horse bean ( Vicia 

 faba) ; and in the field, with sugar beets. 



Experiments with Oats i7i Pots. 



Each t£st was made in duplicate. The soil was what 

 might be called a sandy clay, each pot holding 4,000 grams. 

 The fertilizer was mixed with three-fourths of the soil of 

 each pot. To the soil in each pot were added 0.25 gram 

 of nitrogen, 0.30 gram of phosphoric acid and 0.20 gram 

 of potash. 



Nitrogen . 



(a) Leather, . 

 (6) Dried blood, 



34.85 

 61.91 



26.65 

 36.68 



J.25 

 1.82 



6.95 

 13.41 



Series II, 



* Loc. cit., 144 Centrabl. Agric. Chem., lo, 590. 



