corn, ftraw, and grafs together. The greater 

 number of cattle, the greater quantity of 

 dung, and the more dung, the more corns. 

 So that it may be averred as a certain fadl, 

 that every farm will produce three or fouv 

 times the quantity of corns and grafs, by 

 having a regular rotation of crops, which the 

 fame farm will produce by having it wholly 

 m corns, or wholly in grafs, in the courfe of 

 twenty years ; or, in other words, the pro- 

 fits would be three or four times greater, 

 by having a regular rotation of corns and 

 grafs. 



From this we may draw two conclufions. 



i ft, The farmer who keeps his farm whol- 

 ly in grafs, after a certain number of years, 

 is hurting himfelf, and the nation at large, 

 by withholding the great crops of corns the 

 farm would produce. 



2dly, That farmer is hurting himfelf and 

 the public, who has his farm wholly in corn 

 crops ; for, in a courfe of years, the foil is 

 tired or exhaufted, confequently, the crops 

 every year declining ; befides, the expence of 

 labouring is double for feed, tillage, and ma- 

 nure : Whereas, if he had the one half in 



grafs, 



