AA, On Plaister of Paris. 
Query 9. What is the greatest product per acre of - 
grass, &c. you have known by the means of plaister ? 
Answer. I have had clover which would have made 
two tuns of hay per acre the first crop, and that on 
ground which I am certain without plaister would not 
have produced one third of that quantity; the second 
crop nearly one tun, and reserved the third crop for seed. 
Query 10. Have you ever used it with other manure, 
and what sorts ?—or on ground previously dunged ?— 
and the effects, if any superior to plaister alone? > 
Answer. I have never mixed it with manure previous 
to putting it on the ground, but generally used it on 
ground limed or dunged (or both) not long before, and 
found its effects in a great degree proportionate to the 
manure in the ground (whether limed or dunged) though 
on ground exhausted and never manured, the effect 
was considerable.* 
Query 11. Is there any difference between European 
and American plaister ? 
Answer. I do not remember using any American be- 
fore this year; and as I had none of the other sown at 
the same time, I cannot answer this query ; but it had 
* Nothing is better than plaister to mix with compost beds. 
It forwards the putreiaction, (without consuming them) of 
the vegetable or animal matter composing them. Lime, in 
quantities, or hot, consumes and injures. I often differed 
with my late friend William West on this subject. He was, 
convinced he had begun with too much lime ; and lessened 
the proportions. R. P. 
September 1810. 
* 
