SIGNIFICANCE OF BONE STRUCTURE. • 15 



In conclusion, I wish to express my sincere thanks to the authorities of the Boston 

 Society of Natural Histoiy and of the Museum of Comparative Zoology at Cambridge, 

 for their kindness in allowing me to cut valuable bones. I am indebted for many of the 

 best sections to the skill of Dr. S. J. Mixter, Assistant Demonstrator at the Harvard 

 Medical School. The illustrations are phototypes by the Lewis Company made from 

 photographs taken in every case from the actual specimen. 



DESCRIPTION OF PLATES I-III. 



ITig. 1. Femur of horse, cut Uirough thii-d trochanter. 



" 2. Humerus of mau. 



" 3. Femur of man. 



" 4. Humeru.s of chimpauzee. 



" 5. Femur of chimpanzee. 



" G. Humerus of gorilla. 



" 7. Femur of gorilla. 



" 8. Humerus of mandrill. 



" 9. Humerus of seal {Phoca vituliwi) . 



" 10. Femur of seal {Phoca groenlandica). 



" 11. Humerus of whale {Globicephahis melas?). 



" 12. Humerus of moose. 



" 13. Femur of moose. 



" 14. Humerus of hartebeest. 



" 15. Femur of hartebeest. 



" 16. Femur of kangaroo. 



" 17. Calcaneum of man. 



" 18. " " chimpanzee. 



" 19. " " bear. 



" 20. " " lion. 



" 21. " " seal. 



" 22. Olecranon of man. 



" 23. " " lion. 



" 24. Vertebra of man. 



" 25. " " lion. 



" 26. " " horse. 



" 27. " " seal {Phoca foetida) . 



" 28. " " whale {Qlobicephalus melasi). 



" 29. " " manatee. 



" 30. " " horse mackerel. 



" 31. " " alligator. 



" 32. " " pitlion (horizontal). 



• I 33. " " " (frontal, near posterior end of vertebra). 



" 34. " " " (frontal, near anterior end of vertebra). 



" 35. " " bald eagle. 



