16 



BULLETIN" 320, U. S. DEPARTMENT OF AGRICULTURE. 



Fig. 8. — A spike-tooth harrow, an implement Fig. 9. — A disk harrow, an implement ex- 

 in general use to prepare the seed bed, tensively used for preparing the seed bed. 

 after plowing, for corn. after plowing, for corn. 



Fig. 10. — A spring-tooth harrow, used exten- 

 sively in Michigan, Pennsylvania, and 

 New Jersey in preparing the seed bed, 

 after plowing, for corn. 



Fig. 11. — An acme harrow, an implement 

 especially adapted for thoroughly pul- 

 verizing the seed bed for corn. The 

 evener is attached at A. 



Fig. 12. — A spring-tooth harrow, showing its use in preparing sandy-loam land, after 



plowing, for corn. 



