PAEENT AND OFFSPEFNG 297 



324. Progressive results of artificial selection. While we 

 are still in ignorance of many factors that have to do with 

 the differentiation of two types of plant from one ancestral 

 stock, we have at hand a good many experiments that are 

 instructive (fig. 137). A study of the accompanying tables 

 based upon ten years of experimentation with corn breeding 



FIG. 137. Diversity of form produced by selection and breeding 



Five varieties of Chrysanthemum. All chrysanthemums have descended from a 

 common ancestor similar to the small upper left-hand specimen 



shows that by constantly eliminating the undesired variations 

 and maintaining the desired variations it is possible to accen- 

 tuate the selected characters. In studying the first of these 

 tables note the gradual increase of the percentage of protein 

 materials in one lot and the corresponding decrease in the 

 other lot. For feeding purposes the corn with the largest 

 amount of protein would be more valuable. 



