[20] Osborn, op. cit. p. 142.
[21] See E. Perrier, La Philosophie Zoologique avant Darwin, Paris, 1884; A. de Quatrefages, Darwin et ses Précurseurs Français, Paris, 1870; Packard, op. cit.; also Claus, Lamarck als Begründer der Descendenzlehre, Wien, 1888; Haeckel, Natural History of Creation, Eng. transl. London, 1879; Lang, Zur Charakteristik der Forschungswege von Lamarck und Darwin, Jena, 1889.
[22] See Huxley's article "Evolution in Biology," Encyclopaedia Britannica (9th edit.), 1879, pp. 744-751, and Sully's article, "Evolution in Philosophy," ibid. pp. 751-772.
[23] See Haeckel, Die Naturanschauung von Darwin, Goethe und Lamarck, Jena, 1882.
[24] Origin of Species (6th edit.), p. xvii.
[25] The Life and Letters of Charles Darwin, Vol. 1. p. 83. London, 1887.
[26] A. R. Wallace, My Life, a Record of Events and Opinions, London, 1905, Vol. 1, p. 232.
[27] My Life, Vol. 1. p. 361.
[28] P. Geddes. article "Biology." Chambers's Encyclopaedia.
[29] Origin of Species (6th edit.), p. xv.