NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



217 



FOURTH SECTION 



Antero-posterior diameter of bone, 30 mm. ; lateral, 27 mm. 

 Antero-posterior diameter of medullary canal, 22 mm. ; lateral, 18 mm. 

 Medullary index, 97%. 



FIFTH SECTION 



Antero-posterior diameter of bone, 29 mm. ; lateral, 25 mm. 

 Antero-posterior diameter of medullary canal, 20 mm. ; lateral, 15 mm. 

 Medullary index, 72%. 



SIXTH SECTION 



Antero-posterior diameter of bone, 27 mm. ; lateral, 24 mm. 

 Antero-posterior diameter of medullary canal, 18 mm.; lateral, 13 mm. 

 Medullary index, 58%. 



SEVENTH SECTION 



Antero-posterior diameter of bone, 26 mm.; lateral, 24 mm. 

 Antero-posterior diameter of medullary canal, 16 mm. ; lateral, 13 mm. 

 Medullary index, 50%. 



EIGHTH SECTION 



Antero-posterior diameter of bone, 27 mm. ; lateral, 24 mm. 

 Antero-posterior diameter of medullary canal, 17 mm. ; lateral, 13 mm. 

 Medullary index, 87%.. 



As the foregoing five sections have practically the same minute structure 

 one description will be sufficient for all. 



Structure. — These sections were composed of small and large Haversian 

 systems with a small amount of inter-Haversian lamella?. Some of the systems 

 are senile. The external and internal circumferential lamellae were fragmen- 

 tary. The cancellous bone disappeared at the seventh section. 



NINTH SECTION 



Antero-posterior diameter of bone, 27 mm. ; lateral, 25 mm. 

 Antero-posterior diameter of medullary canal, 17 mm. ; lateral, 15 mm. 

 Medullary index, 61%. 



TENTH SECTION 



Antero-posterior diameter of bone, 27 mm. ; lateral, 25 mm. 

 Antero-posterior diameter of medullary canal, 18 mm. ; lateral, 16 mm. 

 Medullary index, 75%. 



