230 



OIL-CAKE. 



with difficulty into the soil, and is but very slowly 

 decomposed there, it is every way judicious to let it 

 lie upon the dung-hill, or in firmly compacted heaps, 

 which should be from time to time moistened with 

 water or drainings, to which some sulphuric acid has 

 been added, until it becomes sufficiently rotten. 



Rape-seed possesses, in common with other seeds, 

 great abundance of nitrogen and phosphoric acid, but, 

 on the other hand, differs from those of the various 

 kinds of grain, leguminous crops, etc., in the circum- 

 stance of its containing, in lieu of starch, another 

 unazotized substance, namely, fat oil. In the use 

 made of this seed in oil-mills, it loses chiefly oil, 

 together with a triffing quantity of mucilage and 

 albumen ; all its remaining constituents are left be- 

 hind. As the oil possesses no manuring efficacy, 

 the cakes remaining after its removal must necessa- 

 rily contain more manuring elements than the seed 

 from which they were prepared, as is testified by the 

 following analysis of several sorts of oil-cake that 

 are made use of in Saxony as manure for land. 



100 lbs. (perfectly dried) contained : — 



