Farmyard Manure. 



15 



mixed sample of rotten dung produced under the same circum- 

 stances under which the fresh manure was obtained. The rotten 

 dung probably was at least six months' old, possessed a dark- 

 brown, almost black, colour, and appeared to be well-fermented, 

 short dung. 



The general composition of this dung is presented in the sub- 

 joined Table : 



Composition of well-rotten Manure (Mixed Horse, Cow, and Pig Dung}. 

 Analyzed Dec. 5th, 1854. 



Water 



*Soluble organic matter . . 



Soluble inorganic matter 

 t Insoluble organic matter 



Insoluble inorganic matter 



In natural state. 



,. 75-42 



. 3-71 



. 1-47 



. 12-82 



. 6-58 



100-00 



Calculated dry. 



15 : 09 



5-98 



52-15 



26-78 



100-00 



* Containing nitrogen . . 



Equal to ammonia 

 f Containing nitrogen .. 



Equal to ammonia 



Total amount of nitrogen 



Equal to ammonia 



297 

 360 



309 

 375 



606 

 735 



1-21 

 1-47 



1-26 

 1-53 



2'47 

 3-00 



I have determined in this manure likewise the proportion of 

 ammonia present in a volatile form, as well as the ammonia 

 which is disengaged on distilling with quicklime the residue, 

 from which the free ammonia has been driven off, and have ob- 

 tained the following results : 



In natural state. 



Percentage of free ammonia '046 



ammonia in form of salts (readily) 

 decomposed by quicklime) / 



Calculated dry. 



189 

 232 



The proportion of free ammonia in well-rotten dung thus 

 appears not much larger than in fresh dung produced under the 

 same circumstances ; and the amount of ammonia present in 

 rotten dung in the form of salts, which are readily decomposed 

 by quicklime, to be almost identical with that contained in the 

 fresh manure. Further remarks on the composition of rotten 

 dung I shall reserve until I have stated the composition of the 

 soluble and insoluble ash and the detailed composition of the 

 whole manure in its natural and dry state. In the following 

 Table the composition of the soluble part of the inorganic matters 

 in well-rotten farmyard manure is given : 



