The Seed in Plant Production 



397 



In these two cases, the gain from the use of heavy seed is 

 respectively 10.9 and 8.25 per cent. This is by no means 

 a trifling gain when reckoned as additional profit per acre. 



237. Experiments with tobacco. Among practically 

 all varieties of tobacco there is great difference in the size 



FIG. 108. Tobacco plants from seeds of different sizes ; heavy, medium, 

 and light seeds respectively employed, from right to left. [Photograph 

 from Bureau of Plant Industry.] 



