[274] Lectures on Evolution, New York, 1876. Cheap Edition, p. 43.
[275] Coming of Age of the Origin of Species, etc.
[276] Essays on Controverted Questions, p. 450.
[277] "Utebatur autem equo insigni, pedibus prope humanis, et in modum digitorum ungulis fissis; quem natum apud se, cum haruspices imperium orbis terrae significare domino pronuntiassent, magna cura aluit." (Suetonius, Julius, 61.)
[278] The radius and ulna are the two bones of the forearm above the wrist; the tibia and fibula the corresponding bones of the leg above the ankle. In the horse, the ulna and fibula are almost, but not quite, lost.
[279] Animals and plants are placed in different species when the differences between them are only relative; in different genera, when such differences are absolute. Thus, for example, the size of teeth is considered relative; the number of teeth absolute.
[280] American Journal of Science and Arts, 3rd Series, vol. 43 (1892), p. 351.
[281] Modern Ideas of Evolution, p. 119.
[282] Types of Animal Life, 205.
[283] Nicholson and Lydekker's Manual of Palæontology, ii. 1362.