362 PRACTICAL GARDENING. 



Proceeding in the same chemical expression and classification 

 of contents, the following are the results of several other 

 manures : — 



HORSE-DUNG. 



Geine 27*00 



Salts '96 



Water 71-20 



99-16 



It is not so stated, but doubtless the deficiency in the hun- 

 dred parts is loss ; but the value of manure consists in its 

 capacity to produce ammonia, of which we shall offer a notice 

 presently. Mght-soil, by analysis, yields — 



Geine 23-5 



Salts 1-2 



Water 753 



~100-0 



We are informed, then, by Mr. Falkner, that the following 

 are the ultimate results of the three manures : — 1001b. cow- 

 dung will yield of carbonate of ammonia about 2 lb. 2 oz. ; 

 horse-dung, 31b. and nearly a quarter; and night-soil, 151b. 

 and nearly a third. The presence of nitrogen, which regulates 

 the capacity of a manure to produce ammonia, determines the 

 true value of the article, inasmuch, as by unitiug ^vith hydro- 

 gen, it produces pure ammonia. As a passing remark, we 

 may observe that pig-dung is supposed to be upon an equality 

 with night-soil ; but it must always be recollected, that a 

 difference of food makes a dijBference in the relative qualities 

 of the dung of all animals. The experiments undertaken by 

 the Prussian authorities, to ascertain whether the contents of 

 the sewers of Berlin and Dresden could be applied to ferti- 

 lizing the adjacent land, seems to prove that, if land unma- 

 nured produced three bushels for one sown, then — 



Cow-dung would produce 7 



Horse-dung 10 



And night-sod. 14 



But it is not in sewers, which are receptacles for everything, 

 that night-soil could be had in its unmixed state, and conse- 

 quently we may consider that as underrated in value. 



Poudret, which is a preparation of night-sod, good or bad 



