VARIATION 
529 
The first example is a study of wheat. Figure 437 consists 
of bearded wheat, the pollen of which was placed on the 
stigma of the wheat flowers that formed on the non-bearded 
wheat shown at the right in figure. When the kernels of 
wheat in this head ripened, they were sown and a plant 
Figure 436 . — Variation of the Size and Shape of Heads of Wheat. 
All grown from the same kind of wheat. (Photograph furnished by 
Cornell University.) 
