[67] This view is no doubt contrary to the received opinion. I am however interested to see it lately maintained by Driesch (Science and Philosophy of the Organism, London, 1907, p. 233), and from the recent observations of Godlewski it has received distinct experimental support.
[68] In other words, the ova are each either female, or male (i.e. non-female), but the sperms are all non-female.
[69] Morgan, Proc. Soc. Exp. Biol. Med. v. 1908, and von Baehr, Zool. Anz. xxxii. p. 507, 1908.
[70] As Wilson has proved, the unpaired body is not a universal feature even in those orders in which it has been observed. Nearly allied types may differ. In some it is altogether unpaired. In others it is paired with a body of much smaller size, and by selection of various types all gradations can be demonstrated ranging to the condition in which the members of the pair are indistinguishable from each other.
[71] I have in view, for example, the marvellous and specific phenomena of regeneration, and those discovered by the students of "Entwicklungsmechanik." The circumstances of its occurrence here preclude any suggestion that this regularity has been brought about by the workings of Selection. The attempts thus to represent the phenomena have resulted in mere parodies of scientific reasoning.
[72] Vorträge über Viehzucht und Rassenerkenntniss, p. 120, Berlin, 1872.
[73] See Sutton, A. W., Journ. Linn. Soc. xxxviii. p. 341, 1908.
[74] Life and Habit, London, p. 263, 1878