1. H. F. Osborn, Proc. N. Y. Acad. of Sci., meeting of March 9 and April 13, 1896; also Science, November 27, 1896. C. Lloyd Morgan, " Habit and Instinct," October 1896, pp. 307 ff.; also Science, November 20, 1896. J. Mark Baldwin, discussion before N.Y. Acad. of Sci. meeting of January 31, reported in full in Science, March 20, 1896; also Amer. Naturalist, June and July 1896. The following brief statement has been prepared in consultation with both Principal Mdrgan and Professor Osborn. I, may express indebtedness to both of them for certain suggestions which they allow me to use, and which I incorporate verbally in the text. Among them is the suggestion that "Organic Selection" should be the title of this letter. While feeling that this co-operation gives greater weight to the communication, at the same time I am alone responsible for the publication of it as it here stands.
2. This aspect of the subject has been especially emphasised in my own exposition (Atner. Naturalist. June 1896, pp. 447 ff.).
3. Introduction to " Comp. Psych.," pp. 170, 210 "Habit and Instinct," pp. 183, 342.
4. " Mental Development in the Child and the Race," 1st ed., January 1895, p. 364; Science, August 23, 1895.