29& Disease's of Boner 



bone ulceration, as it has been called, and the changed and 

 unchanged parts are in close proximity. A certain amount of 

 symmetry in the diseased patches is seen on the frontal bone, 

 and on the front of the parietal ; but the most advanced patch, 

 Avhich is on the right of the vertex, has no corresponding 

 patch on the left side. At some places the bone is quite 

 smooth, and at others the vascular channels are opened out, 

 sometimes into fine pores, sometimes into pits and erosions, 

 as noticed in previous specimens. On the patch to the right 

 of the vertex these excavations have nearly encircled a piece of 

 bone, which is itself porous. These excavations, or bone ulcers, 

 seem to have been advancing on the right side, while others 

 on the left have been healing over. The interior of the skull 

 over the vault is roughened by enlargement of vascular channels. 

 The diploe is almost entirely filled up by sclerosed bone, and 

 the skull is somewhat increased in weight. The sutures are 

 unusually distinct. B. C. i. 7. M. 23. 



6. 245. Syphilitic (?) Disease of the Skull.— Portion of a 



skull — macerated, illustrating the above. 



There is a loss of substance on the outer surface, which 

 has penetrated into the interior. The section shows the bone 

 to be thickened and sclerosed, F. P. C. 2962. 



(h.) Where the 'process of rarefaction has been healing. 



6. 246. Syphilitic Disease of the Skull.— Skull-cap— macerated, 



illustrating the above. 



The upper surface, especially near the vertex, is roughened, 

 but the irregularities are rounded off as if healing. On the 

 inner aspect, especially at the upper portion of the longitudinal 

 sinus, there are marks of increased vascularity. 



G, C. 988. 



