[1] “While at Hertford I lived altogether in five different houses, and in three of these the Silk family lived next door to us, which involved not only each family having to move about the same time, but also that two houses adjoining each other should have been vacant together, and that they should have been of the size required by each, which after the first was not the same, the Silk family being much the larger.”—­“My Life,” i. 32.

[2] “My Life,” i. 191-2.

[3] “My Life,” i. 108-111.

[4] Darwin makes a similar comment:  “I was very successful in collecting, and invented two new methods ... and thus I got some very rare species.  No poet ever felt more delighted at seeing his first poem published than I did at seeing, in Stephens’ ’Illustrations of British Insects,’ the magic words, ‘captured by C. Darwin, Esq.’”—­Darwin’s Autobiography, in the one-volume “Life,” p. 20.

[5] “My Life,” i. 194-5.

[6] There is no record in his autobiography as to the exact date when he first became acquainted with Lyell’s work, though several times reference is made to it.

[7] “Travels on the Amazon,” p. 277.

[8] “Voyage of the Beagle,” pp. 11-12.

[9] “Voyage of the Beagle,” p. 534.

[10] It is interesting to note that the careers of Sir Joseph Hooker, Charles Darwin, H.W.  Bates, Alfred Russel Wallace and T.H.  Huxley were all determined by voyages or journeys of exploration.

[11] “Life of Charles Darwin” (one-volume Edit.), p. 29.

[12] “Voyage of the Beagle,” p. 535.

[13] This letter may have been written for publication.

[14] A reference to the loss of his earlier collection (p. 29).

[15] The original of this letter is in the possession of the Trustees of the British Museum.

[16] For the other part of this letter see “My Life,” i. 379.

[17] “My early letters to Bates suffice to show that the great problem of the origin of species was already distinctly formulated in my mind; that I was not satisfied with the more or less vague solutions at that time offered; that I believed the conception of evolution through natural law so clearly formulated in the ‘Vestiges’ to be, so far as it went, a true one; and that I firmly believed that a full and careful study of the facts of nature would ultimately lead to a solution of the mystery.”—­“My Life,” i. 254-7.

[18] “On the Law which has regulated the Introduction of Species.”—­Ann. and Mag. of Natural History, 2nd Series, 1855, xvi. 184.

[19] “Life of Charles Darwin” (one-vol.  Edit.), p. 171.

[20] “Life of Charles Darwin,” (one-vol.  Edit.), p. 40,

[21] See post, p. 112.

[22] “My Life,” i. 359.

[23] “My Life,” i. 361-3.

[24] It will be remembered, that Darwin died in April, 1882, twenty-six years previously.