NO. 3 



COMPARATIVE HISTOLOGY OF FEMUR FOOTE 



177 



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



Pl. 27, Fig. 362. Syn. Tab. IX 



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



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



The medullary canal is full. Medullary index, 65%. 



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 lamelhe. Numerous vascular canals occur, and some senile systems appear. 

 The internal circumferential lamellae form a fragmentary ring around the med- 

 ullary canal. 



Type I-III, la, C, senile. 



XIV. 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 upon the 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 which shows such an origin (figs. 363 and 363a, pl. 27). 

 This formation of the Haversian system is especially interesting. 



Detailed Examination 



femur ok an egyptian child, one y ea h old. no. 256479(de) it. s. nat. mus. 



Pl. 27, Fig. :!<;;;. Syn. Tab. I X 



Antero-posterior diameter of bone, 9 mm.; lateral, 11.5 mm. 

 Antero-posterior diameter of medullary canal, 7 mm.; lateral, 8 mm. 

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



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

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



