1866 

 1870 



1875 



1880 



1885 

 1890 



1900 

 1905 

 1910 



1915 



/ 



Fig. 19. Average yields of potatoes to the acre, a, 50 bushels ; b, 

 60 bushels ; c, 70 bushels ; d, 80 bushels ; e, 90 bushels ; /, 100 bushels ; 

 g, 110 bushels. 



252 



