34 On Plaister of Paris: 
Query 11. Is there any difference between slo ied: 
rican and European plaister ? | 
Answer. Not in their effects upon grass or grain that 
I have ever been able to discover, as I have used them 
both on the same field. The European is the easiest 
manufactured, which makes it preferred; but the Ame- 
rican is found to make the strongest cement, and is 
generally used for that purpose. 
PuiLip Pricz, las 
17th of 6th Month. 1796. 
Ricuarp Perers, Esq. Philadelphia. 
I have heard of none who have been more remarkably suc- 
cessful in the plaister system than Mr. West, and ‘Mr. 
Price. They have brought old worn out lands to an astonish- 
ing degree of fertility and profit, by combining the plaister 
with other manures. The gyps was, however, the principal 
agent. As to results in general, my experience and theirs 
agree ; but I think I have proved that dung and plaister 
“mutually assist each other. It appears by Mr. Price’s state- 
ment, that they do not disagree together ; for he states, that 
“where the manure has been put, the crop has been the 
greatest.” 
R. P. 
tural then, but now well known, principle of operation has 
been tested by long experience, there remain no doubts of 
the mutual assistance afforded by dung, or any other animal 
or vegetable putrefying or putrefied substance, and plaister- 
R. P. 
September, 1810. 
