On Plaister of Paris. — 47 
from which the produce in grass was very great; some 
judged three tuns per acre; 1 suppose there was cer- 
tainly two and a half per acre for several crops ; it how- 
ever declined so that in five years their was but little 
~ clover, the old plants dying, and the new ones being 
overpowered or smothered with green grass. I then at 
seeding time broke it up and harrowed in wheat, the — 
next spring sowed it with clover and plaister on the 
wheat. The clover following this operation was light in 
proportion to the former, perhaps owing to the roots of © 
the green and other grass not being sufficiently killed 
by the one ploughing, thereby the plaister not having 
so good an effect on a second application as the first. 
The next plaistered was with respect to having been — 
limed and dunged, the same with the first and the con- 
tinuance of large crops of grass. It was then in the 
spring broke up and planted with corn, and the next 
summer sown with barley and spring wheat; and at or 
about the same time with clover and plaister, which suc- 
ceeded nearly equal to the first time sown with plaister. 
The next second application of plaister was on the 
sward six years after the first plaistering. This piece of 
land had a dressing of rotten dung in the fall. ‘The next 
summer first crop was light, the second crop better 
chiefly green grass and but little clover. The next 
spring where the dung had disappeared, and was incor- 
porated with the soil, it was sown with about two and an 
half bushels of plaister per acre, which was succeeded 
with a middling heavy crop, nearly one half clover, I 
suppose brought forward by the plaister. 
On some other of my fields, within reach of my barn 
yard, that has frequently been dunged, the plaister had 
