Note 3 — Chapter VII
Reading edition
As this horse existed at the same time with animals now extinct, it is not probable, that it is the same species with the recent kind, although from the similarity of the teeth it must have been closely allied. Cuvier, talking of the remains of the horse, found fossil under similar conditions in Europe, remarks, “It is not possible to say whether it was one of the species now existing or not, because the skeletons of these species are so like each other, that they cannot be distinguished by the mere comparison of isolated fragments.”—Theory of the Earth, English translation, p. 285.