308 Diseases of Bone. 



parietal bone some ncAV periosteal bone has formed below and 

 in front of the aperture. The interior of the bone shows- 

 deepened grooves for blood-vessels, and, behind the coronal 

 suture, there is a very deep one like that noted in a similar 

 situation upon No. 6. 245. G. C. 368, 



d. Sequestra, due to syphilis, after separation, 



6. 266. Sequestra after Syphilitic Disease of the SkulL 



— Four sequestra from the skull, probably from different 

 cases. 



The largest, which measures four by three and a half 

 inches at its greatest diameters, shows marks of old-standing and 

 recent irregularity on both sides, but mostly on the inner side. 

 Apparently the inner palate has only been involved in necrosis 

 here and there, for its surface is very irregular. The other 

 pieces, although smaller in size, seem to have more completely 

 involved the whole thickness of the skull. In one, the outer 

 table is comparatively unchanged, while the irregularity is very 

 great on the inner side. In the other two the irregularity is 

 most marked on the outer side, although distinct on the inner 

 side also. G. C. 1169, 



Presented hy Professor James Russell, 



6. 267. Sequestrum after Syphilitic Disease of the SkulL 



— Sequestrum, involving whole thickness of skull. Described 

 previously as " mercurial exfoliation." 



There is great irregularity on the outer surface and marks 

 of increased vascularity on the inner surface. F. P. C. 480. 

 Presented hy Professor John Thomson. 



6. 268. Sequestrum after Syphilitic Disease of the Skull. — 



Sequestrum, which has involved both tables of a thickened 

 skull. 



