Syphilitic Enlargement. 317 



6. 288. Syphilitic Enlarg-ement of the Humerus.— Right 



humerus — macerated, illustrating the above. 



The bone is increased in weight and thickened at its lower 

 end. The surface of the thickened part is extremely rough 

 from projecting processes of periosteal bone. The parts most 

 affected correspond to the places of attachment of the triceps 

 and brachialis anticus muscles. B. C. i. 5. M. 88. 



6. 289. Syphilitic Enlargement of the Humerus.— Eight 



humerus — macerated, illustrating the above. 



The lower end is thickened, especially upon the posterior 

 and outer surfaces. In several places an erosion of the new 

 bone penetrates also into the old, as if an ulcer or sinus in the 

 soft parts had extended downwards into the bone. 



B. C. I. 5. M. 91. 



6. 290. Syphilitic Enlargement of the Radius and Ulna.— 



Right radius and ulna, from the same patient as No. 6. 285 — 

 injected with vermilion, surface cleaned, and in spirit, illustrat- 

 ing the above. 



Considerable irregular periosteal growth is seen on the 

 radius, especially on the back near the two ends. 



On the upper end of the ulna, especially at the outer and 

 back parts, there are patches of vascularity and crusts of new 

 periosteal bone. B. C. i. 5. M. 1. 



6. 291. Syphilitic Enlargement of the Ulna.— Right ulna- 

 macerated, illustrating the above. 



The upper end is greatly enlarged and irregular. Its posterior 

 surface is also eroded and rarified, as if it had formed the base 

 of an ulcer. The lower end of the bone and the articular 

 surfaces are unchanged. B. C. i. 5. M. 92. 



