106 



THE OLIVER PLOW BOOK 



use of a strong and well tapered share required for stony 

 lands, consequently this bottom will penetrate this kind 

 of ground and thoroughly stir it which is necessary if the 

 oxygen in the air is to mix freely in the ground. This 

 kind of plowing cannot be accomplished in these soils 

 with an ordinary bottom. The narrow breast and the 

 high delivery mouldboard insure the earth being well 

 mixed in the process of plowing. 



Illustration I 



Illustration I is a general purpose bottom. This bot- 

 tom is made to plow the volcanic ash soils that are found 



The work of the plow bottom shown in illustration I. Observe the 

 deep furrow wall and the well turned furrow slices. 



