298 Diseases of Bone. 



the skull shows marks of increased vascularit}', especially in 

 the frontal bone, where there has also been some tliickening. 

 The frontal bone where sawn is considerably thickened and 

 condensed. B. C. i. 7. M. 7. 



6. 250. Syphilitic Disease of the Skull. — Skull of an adult 



man — macerated, illustrating the above. 



The whole of the outside of the skull is roughened and 

 irregular. (3n the right side the changes seem to have been o^f 

 long standing and are partially healed. The lower part of the 

 parietal bone has irregular tubercles smoothed over, and the 

 surrounding bone has few vascular channels. On the corre- 

 ponding part on the left side and in front there are alsO' 

 similar tubercles, but their margins are sharper and the bone 

 round is more porous. The Avhole of the top of the skull is 

 porous, and at places the apertures are opened out into irifegular 

 erosions. There is, in fact, scarcely any part of the external 

 surface of the cranial bones which is not changed by an early 

 or receding stage of the opening-out process. Most of the facial 

 bones show similar changes. On the left eminentia articularis- 

 there is a smooth undermined and partially separated scale of 

 bone, as if a layer of the articular surface had been necrosed. On 

 the inside of the skull, except on the anterior and middle fossae,, 

 the surface is roughened by the development of new bone and 

 by the enlargement of vascular channels. B. C. i. 7. M. 21. 



h. "Where the chief changes are in the form of enlargement. 



6. 251. Syphilitic Disease of the Skull.— Portion oi a left 



frontal bone — macerated, illustrating the above. 



The outer surface shows several eminences, the surfaces of 

 which are porous. The section shows the bone to be thickened, 

 the texture being at some places rarefied and at others sclerosed 

 in irregular patches. W. C, G, 39. 



