[25] “Life and Letters of Charles Darwin,” ii. 188.

[26] “The Herbert Spencer Lecture,” delivered at the Museum, December 8, 1910. (Clarendon Press, Oxford.)

[27] “My Life,” ii. 23-4.

[28] “On the Law which has regulated the Introduction of New Species.”—­Ann. and Mag. of Nat.  Hist., 1855.  The law is thus stated by Wallace:  “Every species has come into existence coincident both in time and space with a pre-existing closely-allied species.”

[29] “The Origin of Species.”

[30] “The Origin of Species.”

[31] First Edit., 1859, pp. 1, 2.

[32] “On the Tendency of Species to form Varieties and on the Perpetuation of Varieties and Species by Natural Means of Selection.”  By C. Darwin and A.R.  Wallace.  Communicated by Sir C. Lyell and J.D.  Hooker. Journ.  Linn.  Soc., 1859, iii. 45.  Read July 1st, 1858.

[33] “On the Law which has regulated the Introduction of New Species.” Ann. and Mag. of Nat.  Hist., 1855, xvi. 184.

[34] This seems to refer to Wallace’s paper on “The Zoological Geography of the Malay Archipelago,” Journ.  Linn.  Soc., 1860.

[35] Dr. Samuel Wilberforce.

[36] Now Major Leonard Darwin.

[37] The last sheet of the letter is missing.

[38] Wallace’s paper was entitled “Remarks on the Rev. S. Haughton’s Paper on the Bee’s Cells and on the Origin of Species.”  Prof.  Haughton’s paper appeared in the Ann. and Mag. of Nat.  Hist., 1863, xi. 415.  Wallace’s was published in the same journal.

[39] For March, 1864.

[40] Reader, April 16, 1864.  An abstract of Wallace’s paper “On the Phenomena of Variation and Geographical Distribution, as illustrated by the Papilionidae of the Malayan Region,” Linn.  Soc.  Trans., xxv.

[41] Anthropolog.  Rev., 1864.

[42] Nat.  Hist.  Rev., 1864, p. 328.

[43] “Read June, 1864.”—­A.R.W.

[44] “June 8, 1864.”—­A.R.W.

[45] “Referring to my broken engagement.”—­A.R.W.

[46] Paper on the three forms of Lythrum.

[47] Probably the one on the Distribution of Malayan Butterflies, Linn.  Soc.  Trans., xxv.

[48] E.B.  Tylor’s “Early History of Mankind,” and Lecky’s “Rationalism.”

[49] “Prehistoric Times.”

[50] The note speaks of the “characteristic unselfishness” with which Wallace ascribed the theory of Natural Selection to Darwin.

[51] “Fuer Darwin.”

[52] “On the Pigeons of the Malay Archipelago,” Ibis, October, 1865.  Wallace points out (p. 366) that “the most striking superabundance of pigeons, as well as of parrots, is confined to the Australo-Malayan sub-regions in which ... the forest-haunting and fruit-eating mammals, such as monkeys and squirrels, are totally absent.”  He points out also that monkeys are “exceedingly destructive to eggs and young birds.”—­Note, “More Letters,” i. 265.