116 



Farmyard Manure. 



•i-l QJ 



Soluble silica 9-06 



Insoluble silica 50'61 



Oxides of iron and alumina with phosphates 7" 34 



containing phosphoric acid (4'07) 



equal to bone earth (8"52) 



Phosphate of lime 



Lime 6*40 



Magnesia 2-3:4 



Potash -47 



Soda -40 



Chloride of sodium 



Sulphuric acid "95 



Carbonic acid and loss 3"04 



(80-59) 100-00 

 100-00 



A comparison of the ash of sheep's dung, kept for three 

 years, with the ash of well-rotten good common farmyard manure, 

 will show that in the latter the proportion of phosphate of lime 

 is somewhat larger, and that it is especially much richer in 

 potash than this sheep's dung. On the other hand, this sample 

 of sheep's dung contains a great deal more of silica and earthy 

 matters insoluble in water. 



It is thus evident that by long keeping the most valuable 

 inorganic constituents of sheep's dung are washed out gradually, 

 and by their loss the dung becomes greatly deteriorated in 

 fertilising properties. 



The next Table exhibits the detailed composition of this com- 

 pletely rotten ^heep's dung. 



Completely Rotten Sheep-Manure. 

 Detailed Composition of Mamire in Natural State. 



Water 



Soluble organic matter 



Soluble inorganic matter (ash) : — 



Soluble silica '801 



Insoluble silica '422 



Phosphate of lime '577 



Lime -104 



Magnesia '169 



Potash -370 



Soda -083 



Chloride of sodium^ -022 



Sulphuric acid *076 



Carbonic acid and loss -030 



73-66 

 2-70 



2-66 



Carry forward 



r9-02 



