FOOTNOTES
[10] Darwin: Origin of Species, p. 414.
[11] Darwin: Origin of Species, p. 420.
[12] Cuvier says, in so many words, that classes, orders, and genera, are abstractions, et rien de pareil n’existe dans la nature; but species is not an abstraction!—See Lettres à Pfaff, p. 179.
[13] See Oxford Essays, 1856.