OPERATIONS OF TILLAGE. 



161 



enabled completely to eradicate quack-grass in his Indian 

 corn, by the frequent use of this implement. The dif- 



Fiff. 37. 



ferent kinds of teeth may be adapted to the same frame, 

 and fastened with nuts or wedges, and sliifted in a few 

 moments. The frames are generally made to contract 

 or expand at pleasure, so that the implement may be 

 graduated to different breadths. They are generally 

 drawn by one horse. 



§ 6. The Drill Barrow. 



Drills are used exclusively for sowing seeds, and are 

 various in their construction. They are propelled by 

 manual and by horse power. The former are denominated 

 drill barrows, and are generally adapted to sow^ing single 

 rows. They are of recent introduction in American 

 husbandry, and their use is principally confined to saw- 

 Fig. 38. 



ing turnips, beets, &c.; and some of them, under the 

 name of corn-planters, are employed in planting Indian 



