Farmyard Manure. 203 



mixed sample of rotten clung 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 cf icell-rotten Manure (Mixed Horse, Coic, and Fig Dung). 

 Analyzed Dec. 5tb, 1854. 



In natural state. Calculated dry. 



AVatcr 75-42 



•Soluble organic matter 3"71 15*09 



Soluble inorganic matter 1-47 5*98 



fTnsoluble organic matter 12-82 52*15 



Insoluble inorganic matter 6*58 26*78 



100-00 100*00 



* Containing nitrogen -297 1-21 



Equal to ammonia -StjO 1-47 



t Containing nitrogen -.309 1-26 



Equal to ammonia -375 1-53 



Total amount of nitrogen -GOG 2*47 



Equal to ammonia -735 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 tlie residue, 

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

 tained the following results : — 



■ ~ In natural state. Calculated dry. 



Percentage of free ammonia *04G '189 



„ ammonia in form of salts (readily) .^._ .r)r,o 



decomposed by quicklime) / '^ * ""^^ 



The proportion of free ammonia in well-rotton 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 1 shall reserve until 1 iiavc 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 

 Taljlc the c()m])osition of the soluble part of the inorganic matters 

 in well-rotten farmyard manure is given : — 



