316 Diseases of Bone, 



The bone is increased in weight, and its surfaces are 

 encrusted with new periosteal bone, probably from syphilis. 



B. C. I. 5. M. 12. 



6. 285. Syphilitic Enlargfement of the Humerus.— Section 



of a right humerus — injected with vermilion, partially cleaned 



and in spirit. 



The specimen is from a patient who was supposed to have had 

 syphilis. 



There is thickening of the shaft at the back of the lower 

 end, and patches of vascularity and crusts of new periosteal 

 bone are scattered up and down. B. C. i. 5. M. 1. 



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



humerus — macerated, illustrating the above. 



The bone is increased in weight, and is thickened on its 

 inner and posterior surfaces, especially at the junction of the 

 lower and middle thirds, where a large node has been formed. 

 The prominent part of the node is formed of irregular pro- 

 jections, which get smaller towards the margin. The head and 

 neck show little change. B. C. i. 5. M. 89. 



6. 287. Syphilitic Enlarg-ement of the Humerus.— Upper 



portion of left humerus from the same patient as the last — 

 macerated, illustrating the above. 



The disease on this side is more advanced. A node, some- 

 what similar to the last, but at a lower level, has been present. 

 This node, however, has contained a necrosed piece of bone, still 

 adherent but in process of separation, and having cloacae leading 

 to it. A section has been made through one of the cloacse to 

 show the structure. The whole of the upper part of the shaft 

 is encrusted with new periosteal bone, except here and there 

 where the original surface is seen through it. 



B. C. I. 5. M. 90. 



