SOILS, MANURES, &c. 237 
it upon a ftratum of good mould, five or 
fix inches thick ; this will anfwer two 
* * 
good purpofes : in the fir ft place, the foil 
will receive the ftrongly impregnated 
moifture that naturally drains from the 
dung after rains, and which would, unlefs 
. 
fo preferved, foak into the ground below, 
» 
and be in great meafure loft; and fecond- 
ly, if at each time of turning the dung, 
during fumrner, a little of this lira turn 
be pared off, and laid upon the fur face 
of the mafs, it will forward its putrefac¬ 
tion, and prevent its falts from volati¬ 
lizing in fo copious a degree as if its 
furface was expofed to the heat of the 
fun without fuch a guard. 
When it has been thus treated for 
twelve or fourteen months, it will become 
fufficiently reduced to pafs through a 
coarfe fkreen, or fieve ; this will be 
more eafily performed during a feries 
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