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Answers to Queries on Plaister of Paris ^ by Mr, Edward 

 Duffield^ of Lower Dublin Townships Philadelphia^ 

 County, 



Dear Sir, 



I received your favor of July 20th, 1796, containing 

 a number of queries respecting piaister of Paris, viz. 



Query 1. How long have you used the plaister of 

 Paris ? 



Aiisxver. Every year since 1783. 



Query 2. In what condition was your land when 

 you began the use of it ? 



Answer, It was under timothy grass rather poor, but 

 was improved with three bushels to an acre the first 

 year, the next year it was better, the third year about 

 equal to the first, the fourth year I repeated the plais- 

 ter at four bushels to an acre, when it was very good, 

 at least two and an half tuns from an acre, and continu- 

 ed so several years. This lot hath been plaistered five 

 times since 1783, and is yet good. 



Query 3. What quantity per acre have you general- 

 ly used ? 



Ansxver, From three to five bushels, according t® 

 the soil ; if sandy three bushels ; and more if loamy. 



Query 4. What soils are the most proper for this 

 manure ? 



Answer, Sandy or light loam. 



Query 5. Have you repeated the application of it 

 with or without ploughing— at what intervals, and with 

 what effect ? 



