ec~h I. ' Agriculture and Vegetation. 185 



foil, hinder the roots of the corn to fpread, 

 and draw up a great deal of nourishment. 

 Thefe are generally the roots of the quick 

 grafs. The reft harrow has a large root, 

 which goes very deep. 



THESE weeds, and the roots belonging 

 to them, are deftroyed, I. By fummer fal- 

 lowing. They are torn up by the plough 

 when they begin to fhoot, their roots are 

 expofed to the fun, they fopn wither, and 

 are killed ; or elfe they are juried below 

 the furface. 



2. A METHOD much analogous to the 

 former, is trenching eighteen inches deep. 

 This buries the plants fo deep that they 

 die ; but this can only be put in practice 

 where the foil is good to that depth. 



3. ANOTHER method of killing ufelefs 

 plants is, to hoe them when young. That 

 effectually roots them out. 



4 . No 



