422 Diseases of Bone. 



a calvarium — macerated and trefined, to illustrate the above. 



There is a great but fairly uniform thickening of the frontal 

 bone. The diploe is Avell marked. 



B. C. I. 3. M. 39. 



6. 541. Abnormal Thickness of the Parietal Bone.— Left 



parietal bone of an adult — macerated and trefined to 

 illustrate the above. 



The thickening similar to that of the previous specimen 

 except that the diploe is more condensed. B. C. i. 3. M. 40. 



6. 542. Abnormal Thickness of the Parietal Bone— Portion 



of a right parietal bone — macerated and trefined to illustrate 

 the above. 



The bone is greatly thickened as in the previous specimen, 

 and may have belonged to the same skull. G. C. 989. 



6. 543. Great Thickening" and Condensation of the 



Frontal Bone. — Portion of a frontal bone— macerated and 

 sawn across to show its texture. 



The section shows the bone to be uniformly condensed 

 into an ivory-like consistence. The surfaces of the bone are 

 roughened, but this may have been a post-mortem change. 

 The condensation of this specimen resembles that produced by 

 syphilis. B. C. i. 3. M. 41. 



6. 544. Irregularity of the Interior of the Frontal Bone. 



Portion of the frontal bone " from an elderly woman "—macer- 

 ated, illustrating the above. 



The frontal suture remains. Numerous irregular masses 

 of compact bone are seen on either side of the superior 

 longitudinal sinus. The condition is said to have been caused 

 ' by a tumour on the brain." G. C. 600. 



