[284] Origin of Species, c. xi.
[285] Lydekker, p. 1361.
[286] Evolution of the Horse, 12.
[287] "Succession of Life on Earth" (Recreations in Popular Science, 2nd Series, p. 339).
[288] British Museum (Nat. Hist.) Guide to fossil mammals and birds, p. 38.
[289] American Journal of Science and Art, 3rd Series, vol. 43 (1892), p. 351.
[290] The Evolution of the Horse, p. 16.
[291] Lydekker, ut sup. p. 1363.
[292] Sir W. Flower, The Horse, p. 74.
[293] "It is a consequence of the theory of Natural Selection that identity of structure involves community of descent; a given result can only be arrived at through a given sequence of events; the same morphological goal cannot be reached by two independent paths." Milnes Marshall, Biological Lectures, 247.