256 SOILS, MANURES, &c. 
muri ■■» ■■■ ■ ■■■ 1 nmmmm mmmrnmin^Hmmmmuiwnaummmnmmmi* 1 tm<\«ne*nsp 
being exhaled and loft; but if they be 
taken in a fucculent ftate, and laid in a 
heap, covered with three or four inches 
of earth, they will putrify, and what 
falts they contain will be preferved to 
/ 
confiderable advantage as a manure. 
Animal fubftances produce volatile al¬ 
kaline falts, and vegetable fubftances 
fixed alkaline falts ; but neither fixed 
alkaline falts, nor acids, appear to be 
conftituent parts of living animals, or if at 
all fo, in extremely minute proportion. 
The falts of urine appear to be of a 
peculiar kind, diftinft from all others; 
they participate, in fome degree, of the 
nature both of animal and vegetable 
falts; the ammoniacal abound in them in 
much the greateft quantity, but they are 
found likewife to contain a fpecies of 
tartarous fait, oil, and fome fulphur. 
Urine 
