ILLUSTRATIONS. 



COLOURED ENGRAVINGS. 



Page. 



Frontispiece — The Head of a Horse with the teeth exposed 



Nine months old, and 2 years old 70 



Three years old, and 3 years off • • • • • • • • 80 



Rising 4 years, and 4 years old • • • • • • • • 82 



Rising 5 years, and 5 years old • • • • • • • • 94 



Five years off, and 6 years off • • • • • • • • 96 



Seven years off, and 8 years off • • • • • • . . 104 



Twelve years old, and 20 years old • • • • • • 112 



Sixteen years old, and 30 years old • • • • • • 120 



WOOD CUTS. 



Section of an incisor tooth • • • • • • • • 21 



Arrangement of the substances composing a molar tooth 26 



View of a molar tooth • • • • • • • • • • 29 



A permanent and temporary incisor tooth • • • • 48 



Molar tooth about to be shed • • • • • • • • 62 



Molar tooth recently cut • • • • • • • • • • 62 



Table of the 3 year old incisor tooth • • • • • • 79 



Table of the 3 year off incisor tooth • • • • • • 79 



Tables of the incisor teeth at 4 years off • • • • 85 



