IJST OK ILLISTKATIONS 



Page 



Skeleton of Horse and Man Frontispiece 



1. Involution of tlie Horst' 8 



2. Evolution of the Fore Foot. Principal Stages 10 



3. Evolution of the Hiiul Foot. Principal Stajjes 11 



4. ri)per Teeth. Eohippu.s .15 



.'). Upper Teeth, Oroliippnx .16 



('). I'jjper 'I'eeth, Epihippus 16 



7. ri)per Teeth. Mesohippua 17 



5. Lit tie Three-toed Horse {Mesohippua bairdi) and Four-toed Horse (Eohippus 

 venlir()luf<> . . 18 



9. Skeleton of Three-toed Desert Horse (Hipparion nhitneyi) . . . 19 



10. I'pper Teeth, Pnmhippus 20 



1 1 . I'pjier Teeth, Menjchippus 21 



12. I'pper Teeth, Hipparion 22 



13. I'pper Teeth, Equus 23 



14. Skeleton of Extinct American Horse (Equus scotti) 24 



15. Skeleton of Short-limbed Horse, Hippidium 25 



16. Geological and Geographical Range of Ancestors of Horse 26 



17. Evolution of the Fore Leg. Principal Stages 27 



18. Evolution of the Hind Leg. Principal Stages 28 



19. 20. F:volution of the Teeth 29 



21. Evolution of the Hind Foot of the Horse 31 



22. Fore and Hind Feet. Three-toed Pseudo-horse 33 



23. Fore and Hind Feet. One-toed Pseudo-horse 34 



24. Evolution of the Horse 36, 37 



25. Giant Draft Horse and Shetland Pony • 38 



26. Draft Hor-se Pulling Heavy Load (Skeleton) 40 



27. Arabian stallion "Ximr" (Skeleton) 40 



28. Draft Horse. Rear view showing action of pelvis and backbone 42 



29. Famous American Race Horse ''Sysonby " 47 



30. Incisor Teeth showing different degrees of specialization 49 



31. Inci.sor Teeth showing wear and movement 49 



32. Designation of Teeth 53 



33. \\'earing Surface of Upper Grinding Teeth i^o 



34. Sections of I'pper (irinder of Horse 56 



35. Lower Premolar of Horse 57 



36. Deciduous Molar of Colt 58 



37. Dental Battery of Adult Horse 59 



3S. Dentition of the Colt 61 



