[5] In Rep. 1 to Evol. Committee, 1902, p. 132, attention was called to this possibility, though of course at that date it was in sexual animals alone that it was supposed to exist. It had not occurred to me that even a hermaphrodite plant might be in this condition.
[6] From the description of the offspring of muricata used as mother.
[7] de Vries, Species and Varieties, 1905, p. 259.
[8] Zeijlstra in a recent paper announces that many nanella plants are the subject of a bacterial disease to which he attributes their dwarfness. I gather that this does not apply to all nanella plants and that some are dwarfs apart from disease. The matter may no doubt be further complicated from this cause.
[9] Zts. f. Abstamm., 1912, VIII.
[10] Arch. f. Zellforschung, 1912, IX, p. 331.
FOOTNOTES: CHAPTER VI.
[1] For the evidence see Tutt, J. W., Trans. Ent. Soc., 1898, p. 17. Compare the remarkable case given by Gulick (Evolution Racial and Habitudinal, p. 123) of the two races of Cicada, which are separated by reason of their life-cycles, one having a period of 13, the other 17 years.
[2] For references see Materials, p. 396, and also G. Baur, Amer. Nat., 1893, July, p. 677.