Sect. II. Agriculture and Vegetation. 9 



EARTHS are found to differ very much 

 from one another in their qualities ; far- 

 mers have therefore divided them into fe- 

 veral different kinds, and perhaps have 

 run into too minute divifions. It is dif- 

 ficult indeed to fettle the exact limits be- 

 twixt the different foils -, but fuch difficulty 

 we find in all the divifions of natural bo- 

 dies. The Author of nature has connect- 

 ed different bodies by intermediate ones; 

 he has chpfen to act by different grada-- 

 tions, and not by ftarts, that nature may 

 appear one connected whole. The great 

 divifion, or the fpecific difference of earths, 

 may be reduced to thefe fix, viz. rich 

 black foil, commonly called loam or ha/ley 

 foil} clay ; fandy j moffy -, chalky ; and till. 



WHEN farmers treat of thefe foils, they 

 generally diftinguifh them from one an- 

 other by the colour, or fome other fuper- 

 ficial quality, which immediately (hikes 

 the fenfes. But colour can never lead to 

 the compofition or principles of bodies, on 



which 



