1906.] 



Communication on Regeneration of Bone. 



241 



periosteum during its separation. At the upper extremity of the bone shaft, 

 an irregular spike-like process of bone was left. The wound was then closed, 

 the soft tissues being allowed to coalesce. A case of plaster of Paris was 

 applied loosely to prevent outward pressure. 



No bleeding. Aseptic wound healing, leaving no visible cicatrix, and 

 no adherent scar. After removal of plaster four weeks subsequently, there 

 was no apparent union, a gap being detected between the extremities of the 

 radius. At end of six weeks gap quite marked. Ulna markedly bending. 



Examination of Specimen 10 Weeks After. — The right ulna had markedly 

 bent, and this bending had lessened greatly the interval which would other- 

 wise have existed between the two extremities of the un-united radius. At 

 the part from which the bone had been removed and the periosteum had 

 been left intact there was a gap, void of osseous formation, but filled with 

 dense connective tissue. When this was turned aside, the proximal portion 

 of the bone was seen to be flattened laterally, a new formation of bone 

 continuous with the shaft projecting toward the gap. A somewhat similar 

 formation had taken place below. 



VOL. LXXVIII. — B. 



u 



