[67] ‘Monatsbericht Akad. Wissen.’ Berlin, 1866, s. 372.
[68] International Hort. Congress, London, 1866.
[69] ‘Proc. Bot. Soc. of Edinburgh,’ May, 1863: these observations are given in abstract, and others are added, in the ‘Journal of Proc. of Linn. Soc.,’ vol. viii. Bot., 1864, p. 162.
[70] Prof. Lecoq, ‘De la Fécondation,’ 2nd edit., 1862, p. 76.
[71] ‘Jenaische Zeitschrift fur Naturwiss.’ B. vii. p. 22, 1872, and p. 441, 1873. A large part of this paper has been translated in the ‘American Naturalist,’ 1874, p. 223.
[72] ‘Bastarderzeugung,’ s. 64, 357.
[73] Ibid., s. 357.
[74] ‘Zweite Fortsetzung,’ s. 10; ‘Dritte Forts.,’ s. 40. Mr. Scott likewise fertilised fifty-four flowers of Verbascum phœniceum, including two varieties, with their own pollen, and not a single capsule was produced. Many of the pollen-grains emitted their tubes, but only a few of them penetrated the stigmas; some slight effect however was produced, as many of the ovaries became somewhat developed: ‘Journal Asiatic Soc. Bengal,’ 1867, p. 150.
[75] Duvernoy, quoted by Gärtner, ‘Bastarderzeugung,’ s. 334.
[76] ‘Gardener’s Chronicle,’ 1846, p. 183.