Osseous Tumours. 351 



an enormous fungating tumour of the upper part of the 

 humerus. 



Although this is described in the Bell Catalogue merely as 

 the cast of a fungus tumour of the humerus, it has probably 

 been taken from the previous case. It resembles the drawing 

 by John Bell very closely, and corresponds to his description. 



B. C. I. 6. M. 3. 



B. Osseous and Connective- Tissue Tuviours — ranging from the 

 slowly -growing simple forms ivhose tissties are well devel- 

 oped, to the 7'apidly-growmg malignant forms whose tissues 

 are more or less emhryonic. 



(a.) From the Periosteum and Bone. 



6. 373. Ossification of Muscles of the Thig-h ("Myositis 



Ossificans"). — Upper end of a right femur and adjacent 

 portion of pelvis — macerated, illustrating the above. 



From the margin of the obdurator membrane a sharp 

 spicule of bone, one and a half inches in length, points directly 

 to the insertion of the obturator externus muscle, and has 

 evidently developed the ossification of some of its fibres. 

 Below it, attached to the ascending ramus of the ischium, 

 is a large irregular mass of bone which must have occupied 

 the position of part of the obturator externus and adductor 

 magnus muscles. The outer side of the tuber ischii is 

 nodular. The spine of the ischium is irregular and jagged. 

 The remaining portions of the ischium and as much of the 

 ilium as is present are rough on the surface. 



On the back of the upper end of the femur there is a mass 

 of rough spongy bone corresponding to the position of the quad- 

 ratus femoris muscle; and below the small trochanter an irregular 

 mass of similarly spongy bone arises from the inner surface of 

 the shaft, and occupies a space from above downwards of about 

 four inches, representing, apparently, ossification in the vastus 

 internus and adjacent adductor muscles. This mass of bone is 

 perforated by large sinuses, apparently the position of blood- 



