Osteo-Sarcomata. 367 



of a transverse section of the tibia from, the previous case, to 

 illustrate the above. 



An irregular outgrowth of bone surrounds the tibia, and 

 has evidently been part of the tumour. G. C. 1035. 



6.414. Osteo-Sarcoma of the Tibia.— Plaster cast of the leg 



and foot from the previous case, before amputation. 



The cast shows well the characters described in the history 

 of the case 6. 411. G. C. 1036. 



6. 415. Osteo-SaPCOma of Tibia.— Upper parts of a tibia and 

 fibula of a young person (epiphysis not yet united) — macerated, 

 illustrating the above. 



There has been considerable loss of substance of the tibia 

 at one place with development of new bone in the form of 

 delicate spicules and plates at other places near. This has 

 probably been a case of rapidly growing periosteal sarcoma? 

 which has worked inwards as well as outwards. G. C. 376. 



6.416. Osteo-Sarcoma of Innominate Bone.— Portion of 



an innominate bone — macerated, illustrating the above. 



A very large fungus tumour enveloped this bone. 



The ouCer surface is covered with beautifully delicate 

 spicules and plates, running outwards in various degrees of 

 obliquity, the original bone below being greatly opened out. 



A cast of the os innominatum, shoAving the tumour, and 

 also a specimen of the tumour, were entered in the General 

 Catalogue, but cannot now be traced (1893). G. C. 815. 



6.417. Osteo-Sarcoma of Humerus.— Section of j;he lower 



