A PLAN of the whole. 

 PART I. 



SECT. I. 



Caufes of the Jkia progrefs of agriculture j 

 connection of chymiflry 'with it 5 and divi- 

 fan of the fubjecJ. 



SECT. II. 



Of different foils. 



SECT. III. 



Of the rich black foiL 



SECT. IV. 



Of the clay foil. 



SECT. V. 



Of the fandy foil. 



SECT. VI. 



Of the chalky foil. 



SECT. VII. 



Of till. 



SECT. 



