Beginning with the distribution and development of diminutive Eohippis 50 million years ago, then pausing to survey the horse's relationship to man in medieval times, Crowell devotes a chapter apiece to the exotic, intelligent Arabian who lives with the Bedouin as a member of the family, the independent Przewalski's horse or tarpan of Asia who is the only true wild horse, and related species the ass, zebra, the extinct quagga and the hybrid mule. Concisely written, easily read, amply photo-illustrated -- an informative and interesting summary for discriminating horse lovers.