[52] Essays, i. p. 93.

[53] See Mental Evolution in Animals, pp. 377-8.

[54] [See H. Spencer, The Inadequacy of Natural Selection, A Rejoinder to Professor Weismann, Contemp. Rev. 1893; and Weismannism once more, Ibid. Oct. 1894; Weismann, The All-sufficiency of Natural Selection, Ibid. 1893; and The Effect of External Influences upon Development, "Romanes Lecture" 1894: also Neuter Insects and Lamarckism, W. Platt Ball, Natural Science, Feb. 1894, and Neuter Insects and Darwinism, J. T. Cunningham, Ibid. April 1894. C. Ll. M.]

[55] Variation of Plants and Animals, vol. ii. p. 289.

[56] Ibid. p. 346.

[57] Essays, i. p. 90.

[58] Nature, vol. ix. pp. 361-2, 440-1; and vol. x. p. 164.

[59] [Appendix I.]

[60] For a fuller statement of Mr. Galton's theory of Heredity, and its relation to Weismann's, see An Examination of Weismannism.

[61] For a fuller explanation of the important difference between the mere cessation and the actual reversal of selection, see [Appendix I.]