28 
MANURES. 
this or that manure contains this or that salt in greater 
or less quantity than another. 
The quantity and kind of salts are materially af¬ 
fected by several circumstances, which will be con¬ 
sidered in the next section. An analysis, made when 
the animal is fed and worked one way, will vary from 
the result which would be obtained when the circum¬ 
stances are varied. It is, therefore, quite useless, in 
the general consideration of the composition of ma¬ 
nures, to enter upon the details of each. General 
results, general expressions of facts, are sufficient for 
understanding the nature of animal droppings. It is 
well ascertained, however, that all these droppings of 
various animals contain essentially the same salts as 
does cattle dung. They all contain portions of each 
of the substances which form plants. It will be 
enough for the purpose of this essay, to present to 
your eye, reader, a table, showing the proportions of 
water, mould, and salts, which the dung of yourself 
and your stock presents. 
Water. 
Mould. 
Salts. 
Night soil and hog manure, 
75.8 
23.5 
1.20 
Horse dung, 
71.2 
27.0 
0.96 
Sheep dung, . 
67.9 
22.5 
3.06 
SECTION VII. 
OF THE CIRCUMSTANCES WHICH AFFECT THE QUALITY AND 
QUANTIIY OF ANIMAL LUNG-. 
That we may reduce to some general principle, 
easily understood and easily remembered, the facts 
scattered up and down, among the mass of writers 
and observers, about the different quality of manure 
afforded by different animals, or the same animals at 
different times, let me, reader, request your company 
