Syphilitic Necrosis. 301 



for the most part, replaced by dense bone. This was formerly 

 described as "mercurial caries, with commencing exfoliation of 

 the outer portion of the skull." F. P. C. 318. 



Presented by Professor JoHX Thomson. 



6. 257. Syphilitic Disease of the Skull, with Necrosis.— 



Portion of the vault of a skull — macerated, illustrating the 

 above. 



A large necrosed fragment in process of separation. The 

 outside shows the disease less advanced on the right of the 

 middle line. The roughness is in various stages from opened- 

 out vascular channels to irregular erosions, and one of these 

 is at one place nearly healed over. On the left side, a large 

 fragment, whose surface is for the most part destroyed, has been 

 partially separated, and a groove has been formed round it. 

 From the inside it can be seen that the necrosis, except over a 

 limited area, had not been complete all through, the deeper 

 layers of the bone having furnished granulations for the process 

 of separation. The general inner surface shows marks of 

 increased vascularity. The bone, except at the necrosed part, 

 has been thickened and condensed. W, C. G. 42. 



6. 258. Syphilitic (?) Disease of the Skull, with Necrosis.— 



Anterior and left portion of a calvarium — macerated, illustrating 

 the above. 



The outer surface shows some roughness, chiefly in the 

 form of superficial grooves for blood-vessels. Behind the 

 coronal suture, near the middle line, there is considerable loss 

 of substance, and a small trephine hole penetrates the inner 

 table. A superficial layer of bone seems to have separated 

 from the outer surface here, leaving an irregular deficiency with 

 a. ragged base. On the inside the bone is greatly thickened 



