Xo. 587] VARIABILITY AND AMPHIMIXIS 681 



While any scheme presented must change as new facts 

 are obtained, a terminology is of value in proportion as it 

 gives a basis for future progress. The objection that it 

 s not possible to point out a specific cumulation by no 

 neans indicates the absence of such progressive varia- 

 taking long intervals of time, by the haplwi/ n <l 



