282 Diseases of Bone. 



The upper end of the radius shows patches of absorption 

 passing into the interior and through to the other side without 

 any deposit of new bone on the surface. The ulna shows a 

 similar condition at two places, one at the upper end on the inner 

 side, and another at the back of the shaft. Tubercular disease 

 seems the most probable cause of this condition. G. C. 994. 



6, 208. Tubercular Disease of the Femur.— Upper end of a 



right femur — macerated, illustrating the above. 



There are large patches^ of absorption and rarefaction on 

 the back of the shaft and below the lesser trochanter. The 

 surface of the bone is also somewhat rarefied, especially to- 

 wards the lower end of the specimen. Possibly this has 

 been a case of tubercular disease. F. P. C. 387. 



b. "Where the chief changes are in the form of absorption and enlargement. 



6. 209. Tubercular Enlargement of the Humerus.— Lower 



end of the shaft of a humerus, portion cut out to show the 

 interior — macerated, illustrating the above. 



The interior of the bone is rarefied and hollowed out, and 

 there is a shell of variable thickness on the surface, giving the 

 appearance of expansion. The shaft of the bone above the 

 diseased part has an exceedingly thin shell, and the medullary 

 canal communicates with the hollow below. This condition 

 was formerly called " spina-ventosa." G. C 1152. 



Presented by Professor James Russell. 



6. 210. Tubercular Enlarg-ement of the Lower End of 



the Femur. — Lower end of a left femur, with anchylosed 

 patella — macerated, illustrating the above. 



The articular surfaces are very irregular, and one is par- 

 tially deficient. The interior is rarefied and partially absorbed^ 



