ILLUSTRATIONS 



PLATES 



A. Three stages in the difEerentlation of lacunfe. 



Basic bone substance and differentiated first type bone. 

 Differentiations of second type bone. 



Incomplete and complete differentiations of the third type bone. 

 The three types of bone. 



B. Cross and longitudinal sections of bone types and the reconstruction of bone types and com- 



binations. 



C. Type combinations. 



1. Femora of amphibians and a repaired femur. 



2. Femora of amphibians. 



3. Femora of amphibians and reptiles. v 



4. Femora of reptiles. 

 5-7. Femora of birds. 



8. Femora of fifty genera of bats. 



9-20. Femora of mammals. 



21. Femora of man — embryolo.^ical. 



22-24. Femora of man — negro. 



25. Femora of Pueblo Indian. 



26. Femora of Chicama and Pachacamac Indians. 



27. Femora of Chicama and Egyptian. 



28. Femora of Egj-ptian. 

 29-33. Femora of white race. 



34. Femora of white race and senile Haversian systems. 



35. Femora of white race. 



35. Femur of a male white — idiopathic epileptic. 



