LECTURES AND ESSAYS. 



411 



A B— Line showing income per acre at $2 00 per bushel. 

 C D— " " ' " 1 00 " 



■jy ni ii ii ii it it ii ck ii ii 



rj pr it ii i. ii ii i* kq it ii 



K M— Line (dotted) showing cost per acre at $10.00 per acre on unmanured land, 

 N. B.— The line A B extends above the diagram for the higher yields. 



