C 56 ] 



he can neither condud experiments properly, nor 

 explain the feveral phenomena fatisfadorily which 

 refult from them. 



The ufes which chemiflry may be of in agricuU 

 ture are great and extenfive, but my prefent bounds 

 will only permit me briefly to mention a few of them. 



To this art it belongs, to dillinguifh the fundry 

 kinds of earth, according to their natures and pro- 

 portions; — to determine which of them are the 

 fitteft for different purpofes ; — to afcertain the dif- 

 ferent qualities of the various forts of manures, 

 and to point out proper methods of applying 

 them; — to difcover the beft method of improving 

 a barren foil; — to effed: by a fuitable mixture 

 of earths, what is not to be accomplifhed by 

 manure alone. 



The earths which mofl commonly occur are 

 clay, fand, and calcarious earth, none of which alone 

 is adapted to the fupport of vegetables. Hence in 

 a good foil, they are therefore generally found 

 mixed, at lead two of them, together with a por- 

 tion of decayed vegetable fubftances. 



Clay retains moifture the bed:; after clay, cal- 

 carious- earth ; fand dries rapidly. Hence it fol- 

 lows. 



