[94] Origin of Plant Structures, pp. 38-40.
[95] Errera, Un Ordre de Recherches trop négligé. See also Ludwig, Biologie d. Pflanzen, p. 210.
[96] Gard. Chronicle, 32, 390.
[97] Lindley, l.c.; Ludwig, l.c.
[98] Memories of the Month, First Series, p. 73.
[99] Flowers, Fruit, and Leaves.
[100] Nestler, Sitz. d. K. Akad. d. Wiss. Wien, vol. 3, p. 27.
[101] Squiers, "On the Absorption of Electro-magnetic Waves by Living Vegetable Organisms," December 3, 1904.
[102] Cooke, British Freshwater Algæ, on the authority of Phillips, Trans. Shropshire Natural History Society.
[103] Dickie, Journal Bot. Soc. Edin., vol. 3, p. 79.