36 Animal 
Fic. 16.— Lower front teeth 
at three years of age. Two 
center permanent teeth 
up. 
Fie 17.— Lower front teeth 
at four years of age. Four 
eenter permanent teeth 
up. 
Fie. 18.— Lower front teeth 
at five years of age. All 
permanent teeth up. 
Fic. 19. — Lower front teeth 
at six years of age. Cups 
out in center pair. 
Husbandry 
Fie. 20. — Lower front teeth 
at seven years of age. 
Cups out of intermediate 
pair. 
Fic. 21. —Lower front teeth 
at eight years of age. 
Cups all out. 
ie 
Fic. 22.— Upper front teeth 
at nine years of age. Cups 
out of center pair. 
Fic. 23.— Upper front teeth 
at ten years of age. Cups 
out of intermediate pair. 
