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XXII. An Account of a new and cheap Method of pre- 
paring Pot-afh , with Obfervations. By Thomas Per- 
cival, M. D. F. R. and A. S. Member of the Royal So- 
ciety of Pbyjicians at Paris, &c. 
H E agriculture fociety at Manchefter has long re- 
commended the making of refervoirs for the 
water which flows from dung-hills in farm yards. This 
water is ftrongly impregnated with the falts and putrid 
matter of the dung-hill, and by ftagnation it acquires a 
much higher degree of putrefcence, and probably be- 
comes proportionably more replete with falts. When 
thus collected and improved, it is pumped into an hogf- 
head, which being drawn upon a fledge, or fmall cart, is 
conveyed into the meadows, for the purpofe of fprink- 
ling them with this rich manure. This important im- 
provement in rural oeconomy, I apprehend, has not been 
extended much beyond the diftricft of our fociety ; and it 
feems to be unknown to one of the lateft and mo ft intel- 
ligent writers on hufbandry:. for Lord kaims, in are- 
Read April 6, 1780. 
cent 
