16 Farmyard Manure. 



Analysis made Dec. 5, 1854. 

 Composition of Ash of Portion soluble in Water. 



Soluble silica 17'31 



Phosphate of lime 26-00 



Lime 7'97 



Magnesia .. .. 3'24 



Potash 30-37 



Soda 1-60 



Chloride of sodium 2-53 



Sulphuric acid 3-93 



Carbonic acid and loss .; .. 7'05 



100-00 



On comparing these analytical results with those obtained in 

 the analyses of the soluble ash of fresh dung, it will be seen that 

 the amount of soluble phosphate of lime (bone-earth) in the 

 rotten dung is much greater than in the fresh. Phosphate of 

 lime, next to potash, is the most abundant constituent of this 

 ash. 



Other differences between the soluble ash of fresh and rotten 

 dung are too trifling to call for any special remarks. On the 

 whole, a close similarity in the composition of both is sufficiently 

 apparent. 



The next table represents the composition of the insoluble ash 

 of rotten dung : 



Analysis made Dec. 5, 1854. 

 Composition of Ash of Portion insoluble in Water. 



Soluble silica 21-65 



Insoluble silica 15-35 



Oxides of iron and alumina and phosphates .. 14-40 



Containing phosphoric acid (4*17) 



Equal to bone earth .. ... (9-03) 



Lime 25'34 



Magnesia 1*38 



Potash -69 



Soda -58 



Sulphuric acid "96 



Carbonic acid and loss 19'65 



100-00 



The same constituents which occur in the insoluble ash of 

 fresh manure are found in the insoluble ash of the rotten dung in 

 very nearly the same relative proportions. The insoluble ash of 

 rotten dung, however, contains still less potash, as nearly all pot- 

 ash is contained in the soluble ash. 



From the foregoing results the composition of the whole ash 

 left on burning of well -rotten dung has been calculated. 



