ILLUSTRATIONS 



PLATES 



A. Three stages in the differentiation of lacunae. 



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. 





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 — embryological. 



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 



Egyptian. 



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. 



vii 



