NO. 3 COMPARATIVE HISTOLOGY OF FEMUR FOOTE 215 



EIGHTH SECTION 



Antero-posterior diameter of bone, 28 mm. ; lateral, 26 mm. 

 Antero-posterior diameter of medullary canal, 13 mm.; lateral, 12 mm. 

 Medullary index, 27%. 



NINTH SECTION 



Antero-posterior diameter of bone, 28 mm.; lateral, 26 mm. 

 Antero-posterior diameter of medullary canal, 15 mm. ; lateral, 14 mm. 

 Medullary index, 36%. 



TENTH SECTION 



Antero-posterior diameter of bone, 28 mm. ; lateral, 27 mm. 

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

 Medullary index, 62%. 



ELEVENTH SECTION 



Antero-posterior diameter of bone, 30 mm. ; lateral, 28 mm. 

 Antero-posterior diameter of medullary canal, 21 mm. ; lateral, 20 mm. 

 Medullary index, 100%. 



TWELFTH SECTION 



Antero-posterior diameter of bone, 31 mm. ; lateral, 28 mm. 

 Antero-posterior diameter of medullary canal, 24 mm. ; lateral, 21 mm. 

 Medullary index, 140%. 



Structure. — The above sections resembled in structure the fourth, a de- 

 scription of which is already given. There was, however, an increasing pro- 

 portion of the lamellar background from the fourth to the twelfth section. 

 Senile systems were numerous. 



THIRTEENTH SECTION 



Antero-posterior diameter of bone, 34 mm. ; lateral, 30 mm. 



Structure. — The section is surrounded by a wide lamellar background in 

 which are variously shaped Haversian systems. The remainder of the section 

 is cancellous. 



FOURTEENTH SECTION 



Antero-posterior diameter of bone, 30 mm. ; lateral, 40 mm. 

 Structure. — The section is surrounded by lamelke with a few Haversian 

 systems. The remainder of the section is cancellous. 



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