APPENDIX. II. 
INTENSIVE SEGREGATION, OR DIVERGENCE THROUGH 
INDEPENDENT TRANSFORMATION.* 
I. CLASSIFICATION OF THE FORMS OF INTENSIVE SEGREGATION. 
Ina previous paper on divergent evolution I have enumerated many 
classes of natural causes which produce either separate or segregate 
generation, and which, in their combined action, tend to produce 
cumulative segregation and divergent evolution in every part of the 
organic world. I have there shown, with sufficient fulness, that cumu- 
lative segregation always produces cumulative divergence or poly- 
typic evolution; but I have not fully shown how separation from the 
first involves more or less segregation, or how segregation, which at 
first divides the species into sections with reference to some one en- 
dowment, is always tending toward intensified segregation in which 
the sections present differences in regard to an increasing number of 
endowments. 
After expounding the principles on which these laws of divergence 
rest, I will give a few examples of divergence, calling attention to the 
complete correspondence between the facts of nature and the prin- 
ciples expounded in this and the previous paper. 

* From the Linnean Society’s Journal, Zodlogy, vol. xxm1. Read December 
19, 1889. 
{ Separate generation, or separation, is the indiscriminate division of a species 
into sections that do not intergenerate. Segregate generation or segregation is 
the independent generation of different sections of a species when the sections are 
composed of somewhat divergent classes of variations. Isolation differs from 
selection in that the latter denotes the exclusion of certain kinds from opportunity 
to propagate, while the former denotes the division of those that propagate into 
classes that are prevented from intergenerating. Isolation, or the prevention 
of intergeneration, whether it be through separation or segregation, I also call 
independent generation. Darwin used isolation as equivalent to geographical 
separation, while later writers have come to use it as equivalent to independent 
generation. 
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