VII.] COMPOSITION OF FARMYARD MANURE 203 



weight of water, about two-thirds of i per cent, of 

 nitrogen, one-quarter of i per cent, of phosphoric acid, 

 and one-third of i per cent, of potash, or per ton about 

 15 lb. of nitrogen, 5 lb. of phosphoric acid, and 7 lb. 

 of potash. The composition, however, will vary very 

 greatly, both with the nature and feeding of the animals, 

 and the treatment and storage the manure receives. 



The influence of the feeding is well illustrated in 

 a series of analyses of two lots of dung, made in 



Table LIX.— Percentage Composition of Farmyard Manure 



MADE at RoTHAMSTED FROM ROOTS AND HaY ONLY, OR 



FROM Roots and Hay with Cake. 



Roots and Hay 



only , 

 Cake-fed 



Roots and Hay 



only . 

 Cake-fed 



Roots and Hay 

 only . . 

 Cake-fed 



Roots and Hay 



only . 

 Cake-fed 



(Made into 

 Mixen and 

 stored. 



Do. 



Do. 



Not 

 stored. 



adjoining boxes by bullocks receiving in the one case 

 roots and hay only, and in the other a fattening ration 

 of cake in addition to the roots and hay. The two lots 

 of dung were generally made up into separate mixens 

 out of doors, and sampled a month or two later, when 

 they were carted out to the land ; in one case they 

 were sampled as they left the boxes. Table LIX. 

 shows the analytical results, not only as regards the 



