[933] 'Traité du Citrus,' p. 40.
[934] 'Transact. Hort. Soc.,' vol. iv. p. 318. See also vol. v. p. 65.
[935] Prof. Asa Gray, 'Proc. Acad. Sc.,' Boston, vol. iv., 1860, p. 21.
[936] For the French case, see 'Proc. Hort. Soc.,' vol. i. new series, 1866, p. 50. For Germany, see M. Jack, quoted in Henfrey's 'Botanical Gazette,' vol. i. p. 277. A case in England has recently been alluded to by the Rev. J. M. Berkeley before the Hort. Soc. of London.
[937] 'Philosophical Transactions,' vol. xlvii., 1751-52, p. 206.
[938] Gallesio, 'Teoria della Riproduzione,' 1816, p. 95.
[939] It may be worth while to call attention to the several means by which flowers and fruit become striped or mottled. Firstly, by the direct action of the pollen of another variety or species, as with the above-given cases of oranges and maize. Secondly, in crosses of the first generation, when the colours of the two parents do not readily unite, as in the cases of Mirabilis and Dianthus given a few pages back. Thirdly, in crossed plants of a subsequent generation, by reversion, through either bud or seminal generation. Fourthly, by reversion to a character not originally gained by a cross, but which had long been lost, as with white-flowered varieties, which we shall hereafter see often become striped with some other colour. Lastly, there are cases, as when peaches are produced with a half or quarter of the fruit like a nectarine, in which the change is apparently due to mere variation, through either bud or seminal generation.
[940] 'Transact. Hort. Soc.,' vol. v. p. 69.
[941] 'Journal of Horticulture,' Jan. 20, 1863, p. 46.
[942] See on this head the high authority of Prof. Decaisne, in a paper translated in 'Proc. Hort. Soc.,' vol. i. new series, 1866, p. 48.