[5] Divergent Evolution through Cumulative Segregation (Zool. Journal, Linn. Soc., vol. xx. pp. 189-274).
[6] The passage proceeds to show that in view of this consideration we have a strong additional reason for rejecting the a priori dogma that all specific characters must necessarily be useful characters. For it is evident that any divergence of specific character which is brought about in this way need not present any utilitarian significance—although, of course, natural selection will ensure that it shall never be deleterious.
[7] Revue Scientifique, Nov. 23, 1889.
[8] Nature, Oct. 10, 1889, p. 568.
[9] e. g. p. 81.
[10] See Chapter xxiii. vol. ii. p. 262. (Edition of 1888.)
[11] This term may here be taken as equivalent to Isolation.
[12] Zool. Journal Lin. Soc., vol. xix. pp. 337-411.
[13] Ibid., vol. xx. pp. 202-212.
[14] Zool. Journal Lin. Soc., vol. xxiii. p. 313.