Abstract
THIS paper, only slightly abridged and with about one-third of the figures, appeared in NATURE of April 21 (vol. lxix. p. 590). I am more than “half inclined to regard the Celtic pony as a valid species” and to recognise three species of living horses. I prefer, however, to leave systematists to decide whether Prjevalsky's horse and the Celtic pony should be regarded as species or merely as varieties.
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