xii LIST OF ILLUSTRATIONS 



FIG. PAGE 



17. A temporary or milk tooth. (Roberts, The Horse, Mao- 



millan) . . .... 43 



18. Lower jaw of foal from one to two weeks old. (Roberts, 



The Horse, Maomillan) 44 



19. Lower jaw of the two-year-old colt. (Roberts, The Horse, 



Macmillan) . . ..... 44 



20. Lower jaw of the three-year-old colt. (Roberts, The Horse, 



Macmillan) 45 



21. Lower jaw of the four-year-old. (Roberts, The Horse, Mac- 



millan) . . 46 



22. Side view of the mouth of a four-year-old. (Roberts, The 



Horse, Macmillan) 46 



23. Lower jaw of a five-year-old. (Roberts, The Horse, Mac- 



millan) .47 



24. Side view of the mouth of a five-year-old. (Roberts, The 



Horse, Maomillan) 47 



25. Lower jaw of a six-year-old. (Roberts, The Horse, Mao- 



millan) 48 



26. Side view of the mouth of a six-year-old. (Roberts, The 



Horse, Macmillan) 48 



27. Lower jaw of the seven-year-old. (Roberts, The Horse, 



Macmillan) . . . . . . 49 



28. Side view of the mouth of a seven-year-old. (Roberts, The 



Horse, Macmillan) . ... . . 49 



29. Lower jaw of an eight-year-old. (Roberts, The Horse, Mac- 



millan) 50 



30. Side view of the mouth of an eight-year-old. (Roberts, The 



Horse, Macmillan) 50 



31. Side view of the mouth of an aged horse. (Roberts, The 



Horse, Maomillan) ... .... 51 



32. Lower jaw of an aged horse. (Roberts, The Horse, Mac- 



millan) 51 



33. Shows the wear of an incisor tooth at the ages of three, 



four, five, six, nine and twenty years. (Roberts, The 

 Horse, Maomillan) 52 



34. Cross section of an incisor tooth, showing how the shape 



changes with advancing years. (Roberts, The Horse, 

 Maomillan) 63 



35. Outlinedrawing of a horse 85 



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