[6] Entomologist, vi. pp. 275-278, 339-340.
[7] Verhandl. d. zoolog.-bot. Ges. in Wien, xxi. p. 799.
[8] Darwin, Variations of Animals and Plants under Domestication, ii. p. 282.
[9] “Recherches pour servir à l’histoire des galles,” Ann. des sci. nat. xix. pp. 293 sqq.
[10] According to Dr Adler, alternation of generations takes place between N. lenticularis and Spathegaster baccarum (see E.A. Ormerod, Entomologist, xi. p. 34).
[11] See Westwood, Introd. to the Mod. Classif. of Insects, ii. (1840) p. 130.
[12] For figures and descriptions of insect and gall, see Entomologist, iv. p. 17, vii. p. 241, ix. p. 53, xi. p. 131.
[13] Scottish Naturalist, i. (1871) p. 116, &c.
[14] Vinen, Journ. de pharm. et de chim. xxx. (1856) p. 290; “English Ink-Galls,” Pharm. Journ. 2nd ser. iv. p. 520.
[15] See Pereira, Materia Medica, vol. ii. pt. i. p. 347; Pharm. Journ. 1st ser. vol. viii. pp. 422-424.