[45] Cohn’s Beiträge, 1894.

[47] Pfeffer, in the Annals of Botany, September 1894. Further details in Czapek’s paper in Pringsheim’s Jahrb., 1895.

[48] F. Darwin, Annals of Botany, December 1899.

[51a] Life and Habit, 1878.

[51b] Butler’s term.

[53a] See James Ward, Naturalism and Agnosticism, i. 283

[53b] Science and Culture, Collected Essays, i.

[53c] Loc. cit. p. 288.

[56] Strictly speaking—florets.

[58a] C. Darwin. Climbing Plants.