[71] Examination of Weismannism, p. 83.
[72] Examination of Wiesmannism, p. 93.
[73] Ibid. p. 153.
[74] Origine des Plantes Domestiques, démontrée par la culture du Radis Sauvage (Paris, 1869).
[75] Journl. Agric. Soc. 1848.
[76] Rev. Gén. de Bot. tom. ii. p. 64.
[77] I am indebted to the Rev. G. Henslow for the references to these cases. This and the passages which follow are quoted from his letters to me.
[78] Gardener's Chronicle, May 31, 1890, p. 677.
[79] Since the above was written Professor Weismann has advanced, in The Germ-plasm, a suggestion very similar to this. It is sufficient here to remark, that nearly all the facts and considerations which ensue in the present chapter are applicable to his suggestion, the essence of which is anticipated in the above paragraph.
[80] It also serves to show that Weismann's newer doctrine of similar "determinants" occurring both in the germ and in the somatic tissues is a doctrine which cannot be applied to rebut this evidence of the transmission of acquired characters in plants. Therefore even its hypothetical validity as applied by him to explain the seasonal variation of butterflies is rendered in a high degree dubious.