STUDY OF AGRICULTURE AS A SCIENCE. 2i 



procured What Other substitutes may prove most efficacious 

 feir Humphrey Davy, in his introduction to agricultural chemL: 

 try, remarks, that some lands of g-ood apparelit texture are ye 

 P 'actLc^ffoif V^'^''' ' T' ^""^"°^^ observation and cSmnL' 

 inTthe effpr "^,"^^^"V^ ascertaining the cause, or of remov- 

 mg the efiect. The application of ciiemical tests in such cases 

 isobvious; for the soil must contain some noxious prmcil 

 Sneofre^Pn ''"^' discovered, an^^ probably easily dist^oyed! 

 One of these noxious substances, which such a soil may contain 

 IS the salts of iron. This, chemists have discoveredrmav be 

 decomposed or destroyed by lime. But this defect in thl soil 

 ^nt.Tf^h'^^^' ""'' be discovered by the pSical^^^^^^^ 



oTanv knoXd^^^^ may convince us, that the farmer, with- 



th.s, yet many of them will say timt the k-no^idgrthTderif e 



wmmss 



Fnrrlar,^ c!* ^ ^ 1 . ^^ ' ^"® Tarmers m many parts of the Npw 

 KltivafeTfn' S''^ '">'•'''«<' =>" oi'ini"" th"wheat could n^ 



