Fig. 17. Tools adapted to surface-tilling of fruit-lands. (1) disc-harrow; (2) 

 spike-tooth harrow; (3) Acme harrow; (4) spring-tooth harrow with side frames; 

 (5) riding cultivator; (6) spring-tooth harrow; (7, 8) grape-hoes. In 8, the handle 

 a serves as a rudder or guide. 



(87) 



