Minutes of the Process and Result of sowing of Plaister 
of Paris, from the 3d of April, 1788, until the 5th of 
May, 1795, by Algernon Roberts, of Merion Mont- 
gomery County. 
Process. April 3d, 1788. Drizzly evening wind at 
east, moon’s age twenty-five days; sowed a half peck of 
plaister upon twenty perches in the high field; the 
soila light loam mixed with flinty gravel, in cultivation 
at least four score years, without any manuring in my 
memory. Sown with red clover seed the spring twelve- 
months before sowing with plaister. 
Result. 1789. This spring a perceptible improvement; 
the ground being subject to blue grass, and that not 
sufficiently destroyed by cultivation, rendered the im- 
provement trifling. 
Process. April 4th. Drizzly morning wind eastwardly, 
moon’s age twenty-six days, sowed eight bushels of 
‘plaister upon two acres in the upper end of the young or- 
chard ; the soil in part a stiff and in part a light loam, 
under stratum generally a stiff clay, in tillage at least 
‘ Basxty years. A few years previous to sowing with plais- 
é ter, limed at the rate of forty bushels per acre, and 
-manured at random with barn yard dung, say fifteen 
ids_per acre ; red clover and timothy seed sown 
