256 Diseases of Bone. 



Necrosis, Periosteal Enlargement.— Tibia of a young 



person, in which the shaft having been necrosed has been 

 surrounded by a new shell — macerated. 



In this case there is a central sequesttum, which has 

 originally consisted of almost the entire shaft. During the 

 process of separation, however, it has been partially absorbed, 

 and, as seen through the cloacae, it is in many places rough and 

 irregular. The shell surrounding the sequestrum, although so 

 well formed, is slightly bent. It has numerous cloacal apertures. 



G. C. 1183. 

 Figured in Russell on " Necrosis," plate i. page 177. 



6. 124. Acute Suppurative Osteo-myelitis— Necrosis, 

 Chronic Periosteal Enlargement. — Portion of the shaft 



of a femur or tibia — macerated, illustrating the above. A 

 section has been made of part of the new case to show its 

 thickness. 



The sequestrum has evidently included the greater part of 

 the diaphysis. The surface of the new case at places is eroded, 

 but this has probably happened during the preparation of the 

 specimen. B. C. i. 5. M. 37. 



6. 125. Acute Suppurative Osteo-myelitis of the Tibia- 

 Necrosis, Chronic Enlargement. — Lower two-thirds of 



the right tibia of a young person^injected, soft parts cleaned 

 off and in spirit, illustrating the above. 



Upon the front of the preparation there is a considerable 

 excavation, and in a crevice at its lower end there is a small 

 loose scale of necrosed bone. The appearance of excavation is 

 evidently due to irregular development of new bone round a 

 superficial necrosis, which has now disappeared. This was 

 formerly described as an ulcer of the tibia. If an ulcer of the 

 skin had been present over the affected part of the tibia, as is 

 probable, the ulcer in this case will have been secondary to the 

 bone disease. B. C. i. 5. M. 2. 



