ORGANIC MATTER AND NITROGEN 



205 



pounds of dry matter), 1176 pounds of hay, and used up 1963 

 pounds of straw as food and litter. The other two animals in an 

 adjoining stall consumed exactly the same amounts of mangels 

 and hay, 100 pounds less straw, and, in addition, 672 pounds of 

 oil cake made from hulled cotton seed. 



The stalls in Which the animals were housed during the experi- 

 ment were bricked up to the highest level reached by the accumu- 

 lated manure. The floors were not cemented, but were made of 

 clay which was well rammed, and through which, according to 

 Wood's statement, " there could be little leakage of soluble con- 

 stituents." 



The manure was kept tramped under the feet of the animals, 

 sampled for analysis at the end of the feeding period without 

 disturbing the mass, then left in the compact condition for six 

 months (till November 6, 1906), when it was sampled and weighed 

 (8075 pounds from lot i and 8106 from lot 2) and applied to the 

 soil. Following are the essential results: 



LOT i. (CAKE NOT FED) 



LOT 2. (CAKE FED) 



1 Assuming no loss of phosphorus during storage. 



Wood computes that the following percentages from the oil 

 cake fed were recovered and applied to the soil: 



Dry matter . . . . 29 per cent. 



Nitrogen 37 per cent. 



Phosphorus .... 70 per cent. 



Potassium 52 per cent. 



