The merit of fuch plough to be determined by the Com- 
mittee of Farmers, from its performance at the publick trial 
of ploughs to be made in 1791. 
5. Drill-Plough . — To the perfon who fhall inv'^ent, and 
prefent to this Society, a Drill-Plough for general ufe, more 
fimple and cheap in its conftru6lion, and more perfeft in its 
operation, than any general drill-plough yet known; Twelve 
Guineas. 
6. Cement for Cifierns . — To the perfon who fhall Invent 
a cheap and efFe6lual compofition, that fhall completely an- 
fwer the end of foreign Terras, in the cementing or lining 
of brick or ftone cifierns, fo as to hold water as perfeftly as 
lead will, either under or above ground; Five Guineas. 
7. DeteElion of unwholfome Ingredients in Beer . — To the 
perfon who, from chemical analyfis, fhall difeover an eafy 
and certain method of detefting the infufion of any unwhol- 
fome Ingredient in fmall or flrong Beer, fold by common 
Brewers or Publicans; to the end that families may be en- 
abled to deleft fuch dangerous impofitions; Five Guineas. 
8. Machine for conveying Green Winter Crops off wet 
Arable Land . — To the perfon who fliall invent and conflru6t 
the fimpleft and moll ufetul Machine for conveying Green 
Winter Crops off wet Arable Land, by means of which the 
work may be done cheaper, and with lefs poaching, or other 
Injury to the land than by any method now praftifed ; Ten 
Guineas, or a Silver Cup of that value. 
The machine, or a complete model of it, to be produced’ 
to the Society at or before the meeting in September 1790 
or 1791 ; and proper time for trial allowed. 
9. Defraying Vapours in Coal-Mines . — ^To the perfon who 
lliall conflruft a portable apparatus, on a better and more eli- 
gible plan than thofe now in ufe at Newcallle, or elfewhere, 
and which fhall be capable ot effeftually deflroying or ex- 
pelling the noxious Vapours in Coal-Mines; Ten Guineas. 
If the faid apparatus or machine will not only fully anfwer 
the above purpofe, but alfo produce fufficient light for work- 
ing Coal-Mines, without burning candles or lamps in them, 
this Premium will be enlarged to Twenty Guineas. 
D. * A model 
