DISCONTINUOUS VAEIATION. 



49 



obtain them. The frequency of occurrence of the vari- 

 ous forms is indicated in Fig. 15, given below. 

 Here it will be seen that the curve has five most dis- 



3500 



10 15 20 25 30 35 40 

 Number of Ray-florets. 



FIG. 14. Distribution of Ray-florets in the Ox-eye daisy. 



tinct maxima, corresponding to 3, 5, 8, 10, and 13 petal 

 forms. 



That these multi-humped curves are actually due to 

 a mingling of two or more local races is proved by an 



