Osteo- Sarcomata. 363 



surface of the tumovir. This upper growth is beyond the 

 tumour, and is almost certainly due to the irritation of its 

 presence. It closely resembles the growth due to pus-forming 

 organisms, and may be considered as "irritative." It may be 

 seen near most specimens of periosteal sarcoma. 



This specimen is essentially similar to the last, except that 

 there is less bone. W. C. G. 32. 



6. 404. Osteo-Sarcoma of Femur and Knee-joint.— Lower 



end of a left femur — macerated, illustrating the above. 



There is an extensive formation of new bone round the 

 lower end down to the articular surface, and filling up the inter- 

 condyloid notch. The bone is composed of delicate plates 

 and processes, extending outwards from the surface of the shaft, 

 and more or less closely packed together at different places. 

 Above the new growth for some distance the surface of the 

 bone is rarefied, and beyond that there is the crust of new 

 periosteal bone noted in the previous specimen. G. C. 320. 



Presented by Dr Stenhouse and Professor W. R. Turner. 



6. 405. Cystic Osteo-Sarcoma of Femur. — Sections of the 



anterior part of the lower end of a right femur — macerated, 

 illustrating the above. 

 ^ The tumour occupied the whole of the thigh from the knee to the 



hip-joint, and was cystic in places. 



This specimen shows the characteristic development of 

 delicate plates of bone running outwards from the surface with 

 various degrees of obliquity. The disease does not seem to 

 have reached the synovial cavity of the knee-joint. 



G. C. 314. b. 

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



