34 On Plaister of Paris, 



Query 11. Is there any difference between the Ame- 

 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. 



Philip Price, Jun. 

 nth ofe>th Month. 1796. 



Richard Peters, 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. 



