my endeavours at their complete destruction. I have 
obtained temporary victories over them, but have yet 
to combat their ravages. I know of none in the pesti- 
ferous catalogue, so exhausting and destructive as the 
St. John’s Wort. Besides its being injurious to cattle 
and other stock, it is the greatest enemy the clover hus- 
bandry has to contend with. Plaister will, by forward. . 
ing the red and white clover, and other grasses, overs 
power many weeds; but it has little, if any effect on 
the St. John’s Wort, or ransted. 
Query 12. Is there any difference between the Ame- 
rican and European plaister ? 
Answer. I have in general found the European plais- 
ter the best. But I have used the Nova Scotia (the 
only American plaister I am acquainted with) to equal 
_advantage. I know not whether there has been any 
chemical analysis of these plaisters, to enable us to 
judge of their relative qualities. The quarries in Nova 
Scotia may turn out better the more they are worked 
and explored. There is a variety in the American plais- 
ter, some being much better than others.* 
\ 
* The Nova Scotia plaister I have used for many years. I 
find it equal to any imported from Europe. I have seen 
very little plaister from Europe of late years ; as that from 
Nova Scotia answers all agricultural purposes perfectly. Aad 
I believe all other uses, R. P, 
September, 1810. 
4 
