[14] "Pangenesis" is the name of the new theory proposed by Mr. Darwin, in order to account for various obscure physiological facts, such, e.g., as the occasional reproduction, by individuals, of parts which they have lost; the appearance in offspring of parental, and sometimes of remote ancestral, characters, &c. It accounts for these phenomena by supposing that every creature possesses countless indefinitely-minute organic atoms, termed "gemmules," which atoms are supposed to be generated in every part of every organ, to be in constant circulation about the body, and to have the power of reproduction. Moreover, atoms from every part are supposed to be stored in the generative products.
[15] "Animals and Plants under Domestication," vol. ii. p. 192.
[16] "Animals and Plants under Domestication," vol. ii. p. 414.
[17] "Origin of Species," 5th edit., 1869, p. 110.
[18] Ibid. p. 111.
[19] Ibid. p. 227.
[20] The order Ungulata contains the hoofed beasts; that is, all oxen, deer, antelopes, sheep, goats, camels, hogs, the hippopotamus, the different kinds of rhinoceros, the tapirs, horses, asses, zebras, quaggas, &c.
[21] The elephants of Africa and India, with their extinct allies, constitute the order Proboscidea, and do not belong to the Ungulata.
[22] See "Natural Selection," pp. 60-75.
[23] "Principles of Biology," vol. i. p. 122.