RegeTieration of Os Calcis. 475 



The bones are light, and their texture partially ahsorbed, 

 the head of the astragalus and the base of one of the metatarsal 

 bones being chiefly affected. A crust of new bone has been 

 thrown out on the tibia and fibula. G. C. 936. 



Referred to in Sir George Ballingall's Clin. Lect., Nov. 2, p. 11. 



Presented by Sir George Bai.lingall. 



7. 127. Tubercular Disease in a Regrenerated Os Calcis.— 



Section of the left foot of a boy, aged 14 — in spirit, illustrating 

 the above. 



Dr Joseph Bell excised the os calcis for tubercular disease. The 

 bone was completely regenerated, but two years afterwards the patient 

 presented himself again with a return of the disease in the upper portion 

 of the new os calcis. The foot was therefore amputated. 



A considerable part of the back of the os calcis has been 

 tunnelled by tubercular granulations, now blanched by the 

 spirit. G. C. 2665. 



Presented by Joseph Bell, F.R.C.S.E. 



7. 128. Regfeneration of the Os Calcis after Excision.— 



Plaster cast of the outer half of the right foot of a young man 

 — a different case from the last, illustrating the above. 



Several years before the cast was taken, Dr Joseph Bell excised the 

 OS calcis for tubercular disease, leaving the periosteum. The bone was 

 re-formed so as to maintain the shape of the heel, and the depressed scar 

 was the only abnormal appearance to be detected, 



G. C. 3532. 



P7-esented by ChaVxLy.s'W. Cathcart, F.R.C.S.E. 



7. 129. Disease of Os Calcis, possibly Tubercular.— Eight o& 



calcis — macerated. 



The posterior articular surface for the astragalus is much 

 rarefied. Kew periosteal bone has been formed on the sides 

 of the bone near the afi'ected articulation. B. C. ii. M. 43. 



