ILLUSTKATION OF INCREASE IN CROPS. 191 



Fig. II. 1852. POTATOES. 



Fig. III. 1853. OATS. 



Fig. IV. 1854. CLOVER. 



In Fig. L, the perpendicular lines a b represent the 

 produce of grain, a c that of straw ; in Fig. II., the 

 lines d e the produce of potatoes ; in Fig. III., the lines 



