[8] Ibid. I. pp. 12-17.

[9] Appendix to "Mental Evolution in Animals," pp. 370, 383; see also "The Descent of Man," I. p. 102 et seq.; and "Nature" for Feb. 13, 1873, introduction to a letter to the editor from William Higginson.

[10] P. 103.

[11] Pp. 160, 161.

[12] P. 161.

[13] See also p. 171. And, p. 172, sympathy is designated as "a fundamental element of the social instincts."

[14] P. 178.

[15] Pp. 174, 178.

[16] P. 173.

[17] "Descent of Man," I. p. 199, etc.