Ibid. § 159, p. 100.

Amœnitates Academicæ (1744), vol. i. p. 70. Quoted in Edinburgh Review, October 1868, vol. cxxviii. pp. 416, 417.

Descent of Man, vol. i. p. 228.

Agassiz, Essay on Classification, p. 219.

Ibid. p. 249.

Philosophia Botanica, § 155, p. 98.

Laws of Botanical Nomenclature, by Alphonse Decandolle, translated from the French, 1868, p. 19.

Darwin, The Variation of Animals and Plants, vol. ii. pp. 293, 359, &c.; quoting Paget, Lectures on Pathology, 1853, pp. 152, 164.

Ibid. vol. ii. p. 372.