ILLUSTRATIVE WOOD-CUTS. — VOL I. 



1. The form of the eye, 19. 



2. Section of the anterior part of the human eye, to show the 



manner in which the images of objects are impressed upon 

 the retina, 25. 



3. The iris separated from the eye, and laid out flat, 26. 



4. Head of the eel, showing the form of the eye, 33. 



5. Plan of the h-aman ear, 45. 



6. Bones of the ear, 47. 



7. Bones of the ear separated, 47. 



8. Drum of the ear, 50. 



9. The eye^ showing the transmission of the images of objects , 



81. 

 10. A muscle, 85. 

 11 The lower surface, or base, of the skull, 98. 



12. Uppermost vertebra, or atlas, 100. 



13. Articulation of the first and second vertebras of the neck, 101. 



14. Section of the three lower vertebrae, 103. 



15. Three views of the knee-joints, 105. 



16. Muscle with tendons on different sides, 116. 



17. Figure showing how velocity is acquired by pulling obliquely, 



139. 



18. Figure of the arm, showing the action of the biceps muscle, 



149. 



19. The heart and great blood-vessels, 157. 



20. The two sides of the heart separated. 167. 



21. Section of the ventricle and the artery, 169, 



22. Valve of the great artery, 174. 



23. Bones of the human foot, 214. 



24. Heads of birds, showing the form of the bills, 230. 



25. Head and neck of the heron, 232. 



