[230] Proceedings Academy of Natural Science, Philadelphia (1877), p. 318.

[231] Proceedings of the American Philosophical Society (1889), p. 546.

[232] Transactions American Philosophical Society, xvi. (1890), and later papers.

[233] American Journal of Morphology (1891), pp. 395, 398.

[234] “Über die Darwinische Theorie in Besug auf die geographische Verbreitung der Organismen.” Sitzenb. der Akad. München, 1868. Translated by J. L. Laird under the title, The Darwinian Theory and the Law of the Migration of Organisms. London, 1873. Also Ueber den Einfluss der geographischen Isolirung und Colonierbildung auf die morphologischen Veränderungen der Organismen. München, 1870.

[235] Linnæan Society’s Journal: Zoölogy, xi., 1872.

[236] Linnæan Society’s Journal: Zoölogy, xx., 1887, pp. 189–274, 496–505: also Nature, July 18, 1872.

[237] Evolution without Natural Selection; or, The Segregation of Species without the aid of the Darwinian Hypothesis, London (1885), pp. 1–80.

[238] Revue Scientifique, xix. (1877). p. 669. Quoted by Giard in Rev. Sci., 1889, p. 646.

[239] Animal Life as Affected by the Natural Conditions of Existence. By Karl Semper. The International Scientific Series. New York, 1881.