[924] Müller's 'Physiology,' Eng. translat., vol. i. p. 407.
[925] See some remarks to this effect by Sir H. Holland in his 'Medical Notes,' 1839, p. 32.
[926] This is the view taken by Prof. Häckel, in his 'Generelle Morphologie' (B. ii. s. 171), who says: "Lediglich die partielle Identität der specifischconstituirten Materie im elterlichen und im kindlichen Organismus, die Theilung dieser Materie bei der Fortpflanzung, ist die Ursache der Erblichkeit."
[927] In these remarks I, in fact, follow Naudin, who speaks of the elements or essences of the two species which are crossed. See his excellent memoir in the 'Nouvelles Archives du Muséum,' tom. i. p. 151.
[928] Godron, 'De l'Espèce,' 1859, tom. ii. p. 44, &c.
[929] Journal Proc. Linn. Soc., 1858, vol. iii. p. 60.
[930] 'The Quarterly Journal of Science,' Oct. 1867, p. 486.
[931] M. Rufz de Lavison, in 'Bull. Soc. Imp. d'Acclimat.,' Dec. 1862, p. 1009.
[932] 'Races of Man,' 1850, p. 315.
[933] 'Travels in Peru,' Eng. translat., p. 177.