286 Diseases of Bone. 



There has been advanced tubercular disease of the articular 

 surfaces. The position previously occupied by articular cartilage 

 is opened out and deeply excavated at three places. On the 

 inner articular surface, near the back, there is a piece of necrotic 

 bone in process of separation, and with part of its surface 

 smooth. Round the head of the tibia some new periosteal 

 bone has been thrown out, probably from sepsis. 



F. P. C. 767. 

 Presented by Professor John Thomson. 



6. 219. Tuberculap Disease of the Clavicle.— Right clavicle 



— macerated, illustrating the above. 



The bone is very irregular. Portions have been eaten out 

 as if by the burrowing of tubercular granulations, or after the 

 separation of sequestra, and numerous bridges have been 

 left, connecting outstanding spicules with the rest of the bone. 

 The sternal end is the part most affected; the outer end is 

 scarcely changed. Comparatively little new bone has been 

 formed. 



G. C. 3396. 



6. 220. Tubercular Necrosis and Enlarg-ement of the 



First Metacarpal Bone. — Metacarpal bone of a thumb — 

 macerated, illustrating the above. 



A shell of new periosteal bone, with numerous cloacal 

 apertures, has formed round the remains of the original shaft. 

 These remains can be seen through the apertures, with the 

 tissue partially opened out, and for the most part absorbed. 



Described and figured in. Mr Benjamin Bell's work on the Bones, 

 plate i. fig. 7. 



G. C. 937. 

 Presented by Adam Hunter, F.R.C.S.E. 



6. 221. Tubercular Necrosis and Enlargement of the 



