[23] Godron, ‘De l’Espèce,’ tom. ii. p. 52.
[24] ‘Journal of Horticultural Soc.,’ vol. vii., 1852, p. 117.
[25] ‘Journal of Hort. Soc.,’ vol. i. p. 160.
[26] See Lecoq, on the Villosity of Plants, ‘Géograph. Bot.,’ tom. iii. pp. 287, 291; Gärtner, ‘Bastarderz.,’ s. 261; Mr. Masters on the Opuntia, in ‘Gardener’s Chronicle,’ 1846, p. 444.
[27] ‘Pom. Phys.,’ p. 136.
[28] ‘Ampélographie,’ 1849, p. 19.
[29] Gärtner, ‘Bastarderz.,’ s. 606, has collected nearly all recorded facts. Andrew Knight (in ‘Transact. Hort. Soc.,’ vol. ii. p. 160) goes so far as to maintain that few varieties are absolutely permanent in character when propagated by buds or grafts.
[30] Mr. Blyth, ‘Annals and Mag. of Nat. Hist.,’ vol. xx. 1847, p. 391.
[31] ‘Natural History Review,’ 1862, p. 113.
[32] ‘Journal of Roy. Geographical Soc.,’ vol. ix., 1839, p. 275.