378 Diseases of Bone. 



plate, and is blended with the membranous wall of the cavity. 

 Apparently, therefore, the tumour has been of comparatively 

 slow growth. The bones of the foot are light and translucent. 



B. C. I. 6. M. 4. 



6. 434. Central Sarcoma of the Ulna. — Remains of the lower 



end of a left ulna, with corresponding part of radius and the 

 first row of carpal bones — muscles cleaned off and in spirit, 

 illustrating the above. 



The lower end of the radius has been almost completely 

 destroyed, and an imperfect shell, composed partly of bone 

 and partly of membrane, with "honeycomb" markings on its 

 interior, is all that now represents it. 



This must have been a central tumour, which has been re- 

 moved in the process of preparation. Formerly called "spina 

 ventosa." G. C. 1060. 



Presented by Professor James Russell, 1827. 



6. 435. Central Sarcoma of the Lower End of the Humerus 



and Elbow-Joint. — The section shows the lower end of the 

 humerus to present a V-shaped opening towards the elbow-joint, 

 A mass of decolorised tumour substance occupies the 

 elbow-joint, and surrounds the head of the radius. It projects 

 also from the skin backwards, but has been sliced off there. 

 On the inside, the skin over the joint is scarred, probably the 

 result of former treatment. G. C. 791. 



Presented by Sir George Ballingall, 1825. 



6. 436. Central Sarcoma of the Lower End of the Humerus 

 and Elbow-Joint. — Plaster cast of previous tumour before 

 amputation. F. P. C. 2906. 



6. 437. Central Sarcoma of the Lower End of the Femur. 



