244 
REV. J. T. OULICK ON DIVERGENT EVOLUTION 
generating forms are at the same time equally successful ; where- 
fore it is not the success, hut the separateness of the success, 
that is due to the segeneration. 
(4) The continuance of the descendants of a group in a special 
form will depend on its Segregation ; hut this is a very different 
thing from the special success of its descendants. The preser- 
vation of a special hind of adaptation is never due to natural 
selection, which is the superior success of the higher degrees of 
adaptation of every kind. 
(5) The power of migration, or any other power directly related 
to the environment, may be accumulated by natural selection, 
and afterward lead to Segregation ; but, according to my method 
of judging, the continuous advantage of Segregation over Inte- 
gration can never be shown, for both are equally essential in the 
economy of nature ; and though one process may at one time 
predominate over the other, the comparative advantage of Segre- 
gation, if there be such advantage, cannot be the cause of the 
preservation of forms endowed with segregative qualities, for 
they will certainly be preserved as long as they are able to win a 
bare existence, which is often a lower grade of success than the 
one from which they are passing. 
(6) According to my view, instead of the accumulation of the 
Segregative prepotency depending on natural selection, the accu- 
mulation of divergent forms of natural selection depends on some 
form of Segregation. 
But if the accumulation of Prepotential Segregation is not due 
to Natural Selection, how- shall we explain it P It is, I think, 
duo to the fact that those forms that have the most of this 
character are, through its action, caused to breed together. We 
have already seen, when considering Seasonal and Sexual Segre- 
gation, that, if Segregation is directly produced by the instincts 
or physiological constitution of the organism, there is a tendency 
tow r ard an increasing manifestation of the character in successive 
generations. Those that have but a slight degree of Segregate 
prepotency eventually coalesce, forming one race, while those 
possessing the same character in a higher degree remain more 
distinct, and their descendants become still more segregate and 
still more permanently divergent. As long as the segregate 
forms are able to maintain vigour and secure fair sustentation, 
the process continues aud the separation becomes more pro- 
nounced. Of this form of the Law of Cumulative Segregation 
