[{222}] The author had not at this time the knowledge of the meaning of dimorphism.
[{223}] «Note in original.» Compare feathered heads in very different birds with spines in Echidna and Hedgehog. «In Variation under Domestication, Ed. ii. vol. II. p. 317, Darwin calls attention to laced and frizzled breeds occurring in both fowls and pigeons. In the same way a peculiar form of covering occurs in Echidna and the hedgehog.»
Plants under very different climate not varying. Digitalis shows jumps «?» in variation, like Laburnum and Orchis case—in fact hostile cases. Variability of sexual characters alike in domestic and wild.
[{224}] A corresponding passage occurs in Origin, Ed. i. p. 83, vi. p. 101, where however Nature takes the place of the selecting Being.
[{225}] The mistletoe is used as an illustration in Origin, Ed. i. p. 3, vi. p. 3, but with less detail.
[{226}] «Note in original.» The selection, in cases where adult lives only few hours as Ephemera, must fall on larva—curious speculation of the effect «which» changes in it would bring in parent.
[{227}] This section forms part of the joint paper by Darwin and Wallace read before the Linnean Society on July 1, 1858.
[{228}] Occurs in Origin, Ed. i. p. 64, vi. p. 79.
[{229}] Corresponds approximately with Origin, Ed. i. pp. 64-65, vi. p. 80.
[{230}] This simile occurs in Origin, Ed. i. p. 67, not in the later editions.