x ii CONTENTS. 



PAGE 



toed horses of Europe and America Existing species of 

 horses The horse (Equus caballus] Wild, domesticated, 

 and feral horses Wild assas Equus hemionus of Asia and 

 its varieties The African wild ass and the domestic ass 

 (Equus asinu*) Striped members of the equine family 

 Zebras and quaggas (Equus zebra, E. burchelli, E. grevyi, 

 and E. quagga) Hybrids or mules Aptitude for domesti- 

 cation only found in certain members of the family. 



CHAPTER III. 



THE STRUCTURE OF THE HORSE, CHIEFLY AS BEARING UPON 

 ITS MODE OF LIFE, ITS EVOLUTION, AND ITS RELATION 

 TO OTHER ANIMAL FORMS 102 



The skull The teeth : their number ; general characters 

 and structure ; crown, root, pulp, dentine, enamel, and ce- 

 ment Succession of teeth Temporary and permanent sets 

 Special characters of the teeth of the horse Incisors 

 Canines Diastema Molars Brachydont and hypsodont 

 dentition Temporary or milk teeth Time of appearance 

 and order of succession of the teeth The lips The nostrils 

 The false nostrils The guttural pouches The neck 

 Vertebrae Cervical ligament. 



CHAPTER IV. 



THE STRUCTURE OF THE HORSE (continued) . . . 153 



General characters of the limbs of vertebrated animals- 

 Comparison of the skeleton of the fore limb of the horse with 

 that of man Comparison of the skeleton of the hind limb 

 of the horse with that of man The muscles of the limbs 

 The warts or callosities on the external surface of the limbs 

 The ergot or spur The chestnuts, or mallcnders #nd sal- 

 lenders The hoofs. 



