Tumours of the Lower Jaw. 399 



From the unworn appearance of the erupted teeth, and the 

 presence of the wisdom tooth in the jaw, this has evidently been 

 from a young person. G. C. 3419. 



6. 481. Ossifying- Sarcoma of the Lower Jaw.— Greater part 



of the right and portion of left side of a lower jaw — in spirit, 

 illustrating the above. 



An ossifying sarcoma replaces the greater part of the bone, 

 invading the floor of the mouth, and passing outwards as well. 

 The teeth have been loosened, and comparatively little of the 

 original jaw structure remains, G. C. 1040. 



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



6. 482. Ossifying- Sarcoma of the Lower Jaw. — Plaster cast 



of chin and neck, apparently from the patient from whom the 

 last specimen was taken. 



Eeference was made in the M.S. Catalogue to a cast of the 

 last preparation. That cast is now missing, but as this cast had 

 lost its number, and as it corresponds to the previous specimen, 

 it is most probably the one in question. G. C. 1040. a. 



6. 483. Tumour of the Lower Jaw. — Plaster cast of a tumour 



of the lower jaAV. 



It had apparentlj"- started from the left side of the lower 

 jaw, and grown downwards into the neck. Its outer surface is 

 somewhat lobulated. F. P. C. 2866. 



3. Central Tumours — ranging from the more slowly -growing 

 simpler forms whose tissues are letter developed to the 

 rapidly-growing malignant forms whose tissues are more 

 or less embryonic, 



6. 484. Myeloid Sarcoma of the Lower Jaw.— One half of a 



