( 27 ) 
Thus let it remain together three or four 
weeks, according to the quantity and ftrength 
of heat, in order that it may meliorate, by 
difcharging the rank obnoxious fteam ; and 
if it is turned over once every week, it will ftill 
incorporate the parts more effectually, and 
give an additional vent to the fierce ferment. 
This preparation of the dung is abfolutely 
neceffary, as without fuch precaution, when 
formed into a clofe bed, it is apt to acquire 
fuch a vehement degree of heat, as to burn 
and exhauft its vegetative power, without 
being able to effeCt the purpofe intended ; for 
the fpawn requires a bed that only gradually 
advances to its full heat, and declines in the 
fame gradual manner; till reduced to the low, 
kindly, growing warmth that is peculiar to the 
nature of the fpawn, and the growth of the 
Mufhroom; 
D a 
Of 
