NO. 3 COMPARATIVE HISTOLOGY OF FEMUR FOOTE 177 



RIGHT FEMUR OF A JAPANESE MALE. NO. 245, CR. MEU. COLL. 



Pl. 27, Fi(!. 363. Syn. Tab. IX 



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



Antero-posterior diameter of medullary canal, 20 mm.; lateral, 18 ram. 



The medullary canal is full. Medullary index, 657c)- 



Structure. — The external circumferential lamellae form an enclosing ring of 

 various widths. It is widest in the anterior and inner wall, and is interrupted 

 by Haversian canals of the (la) differentiation. The central ring is composed 

 of Haversian systems, large and small, interrupted by irregularly shaped areas 

 of lamellfe. Numerous vascular canals occur, and some senile systems appear. 

 The internal circumferential lamella,' form a fragmentary ring around the med- 

 ullary canal. 



Type I-III, la, C, senile. 



XTV. MAN— ANCIENT EGYPTIAN 

 Nine femora were examined. 



General Character of the Femur 



The Egyptian femora were taken from the cemeteries of Egypt of the 

 Twelfth Dynasty (2000 B. C). The series includes the femora of the child, 

 adolescent, and adult. 



The femora are rather small in size and variable in shape. 



The medullary surface is less corrugated than it is in modern white bones. 



The medullary index varies from 27% to 111%, with an average of 39.5%. 



The type varies from a third to a second and third, or first and third, 

 depending \n»m tlie age in years. The femur of a child about one year old 

 shows the formation of Haversian systems directly from the circulation. It is 

 the only femur examined wliich shows such an origin (figs. 3(i3 and 3(i3a, pl. 27). 

 This formation of the IIa\ersian system is especially interesting. 



DE'rAii.ED Examination 



femur of AN E(iYPTL\N Cllll.li, n.Nl.; VKAIi (il>li. NO. 25G47;i ( <lt' ) LT. S. NAT. MUS. 



!'[.. ■.'';, Fill. .')<i:i. sv\. 'r All. i.\ 



Antero-posterior diameter of hone, !• miu.; hitcial, 11.') iimi. 

 Antero-posterior diameter of iiieduihiry canal, 7 mm.; lateial, S uiin. 

 The medullary canal is full. iMcdiilhuy index, 111%. 



Structure.— The section siiows three concentric, parallel groups of blood 

 vessels. One group is near the external surface (fig. 363D), a second occupies 



