SOIL MOISTURE AND PREPARATION OF SOIL. 71 



the clods, as a drag, or planker, or rolling cut 

 ter harrow (Fig. 23), or spring-toothed harrow 



t- 



FIG. 24. A STRING-TOOTHED HARROW. 



(Fig. 24). The seed-bed may be completed by 

 a fine-toothed, lighter harrow, or a cottlter 

 harrow (Fig. 25), which "cuts, turns, and pul- 

 verizes " the soil. 



FIG. 25. A COULTER-TOOTHED HARROV/. 



The roller is not used so much as formerly, 

 since it leaves the soil in such a condition that 

 capillary water may rise to the surface. Plank- 



