[229] Annual Report of the United States Geological and Geographical Survey Territories, 1873. Pp. 543-560. See also the author's monograph of Geometrid Moths or Phalænidæ of the United States, 1876, pp. 584-589, and monograph of Bombycine Moths (Notodontidæ), p. 50. [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. [240] _Organic Evolution as the Result of the Inheritance of Acquired Characters, according to the Laws of Organic Growth._ Translated by J. T. Cunningham, 1890. [241] _On Orthogenesis and the Impotence of Natural Selection in Species Formation._ Chicago, 1898. [242] _Die Farbenevolution bei den Pieriden_. Leiden, 1898. [243] "On Mechanical Selection and Other Problems." _Novitates Zoologicæ_, iii. Tring, 1896. [244] _Entwicklung der Raupenzeichnung und Abhängigkeit der letzeren von der Farbe der Umgebung_, 1894. [245] _Transmutation der Schmetterlinge infolge Temperatur-veränderungen_, 1895. [246] _Ueber den Einfluss der Temperatur bei der Erzeugung der Schmetterlings-varietäten_, 1880. [247] _Ueber Farbenwechsel bei niederen Wirbelthieren, bedingt durch directe Wirkung des Lichts auf die Pigmentzellen._ _Centralblatt für Physiologie_, 1891, v., p. 326. [248] _Ueber den Farbenwechsel der Frösche._ _Pflüger's Archiv für Physiologie_, 1892, li., p. 455. [249] _Leçon d'Ouverture du Cours de l'Évolution des Êtres organisés._ Paris, 1888, and "Les Facteurs de l'Évolution," _Revue Scientifique_, November 23, 1889. [250] _Revue Encyclopédique_, 1897. p. 325. Yet we have an example of the appearance of a new organ in the case of the duckbill, in which the horny plates take the place of the teeth which Poulton has discovered in the embryo. Other cases are the adductor muscles of shelled crustacea. (See p. 418.)