On Plaister of Paris. | 39° 
Query 11. Its duration ? 
Answer. In one instance I mowed the same ground 
four years successively after four bushels per acre of 
plaister had been applied, but I find that blue grass — 
generally begins to appear the third year; therefore I 
wish to mow or pasture the ground two years only, o 
then plough again. 
Query 12. Is there any difference as to useful effects, 
between the American and European plaister? 
Answer. 1 cannot yet tell. The trials made with the 
American plaister on barley and clover this spring, 
mentioned in answer to the tenth query, are my first 
essays ; the prevalent report of its bad quality, prevent- 
ed my making an earlier trial. At present the effect of. 
the American plaister appears equal to any thing that 
might be expected from the European. _ 
I wish it had been in my power to have given fuller 
answers to the questions you have been pleased to ask 
me. In doing it I have confined myself to simple facts, 
avoiding comments and matters of opinion, SUppOSaS 
them foreign to your design. 
With much respect, 
{ have the honour to be, 
Dear Sir, 
Your very humble servant, 
Epwarp Hanp. 
The Hon. Ricuarp Prrers Esq, 
