214 



SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE 



vol. 35 



SECTION THROUGH THE LESSER TROCHANTER 



Antero-posterior diameter of bone, 37 mm.; lateral, 28 mm. 



This section is surrounded by an envelope of bone, ranging in thickness 

 from 1 mm. in the posterior to 4 mm. in the outer, 2.5 mm. in the anterior and 

 5 mm. in the inner wall. 



From the inner wall the calcar femorale, an extension inward of the sur- 

 rounding envelope, gradually separated into cancellous bone which then merged 

 into that occupying the whole central portion of the section. 



Structure. — The envelope was composed of indistinctly lamellated bone 

 with diffusely arranged lacunae and bushy canaliculi, interrupted by crude Ha- 

 versian systems. The walls of the cancellous meshes were composed of lamellae 

 without Haversian systems. 



FOURTH SECTION 



Antero-posterior diameter of bone, 33 mm. ; lateral, 28 mm. 

 Antero-posterior diameter of medullary canal, 19 mm. ; lateral, 19 mm. 

 Medullary index, 67%. 



Structure.— With the exception of the posterior ridge this section was sur- 

 rounded by a wide horseshoe-shaped background of lamellae, forming half of 

 the thickness of the entire wall of the bone, and containing many Haversian 

 systems of the (la) and (C) differentiations. 



The posterior ridge was composed of Haversian systems, between which 

 were lamellae with many large, oval lacuna? and bushy canaliculi. The central 

 ring was narrow and composed of Haversian systems with some inter-Haversian 

 lamellae. Many of the Haversian systems were senile. A narrow ring of in- 

 ternal circumferential lamellae surrounded the medullary canal. 



FIFTH SECTION 



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

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

 Medullary index, 28%. 



SIXTH SECTION 



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

 Antero-posterior diameter of medullary canal, 13 mm.; lateral, 10 mm. 

 Medullary index, 22%. 



SEVENTH SECTION 



Antero-posterior diameter of bone, 28 mm. ; lateral, 25 mm. 

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

 Medullary index, 23%. 



10 mm. 



