502 Diseases of Joints. 



is also fi smaller aperture with a blind extremity a little' 

 below the first one. The remains of the bicipital groove is 

 seen between the upper parts of the altered tuberosities. The 

 glenoid cavity is flattened and enlarged by growth of bone at 

 the margins. The lower portion of the surface is rarefied. At 

 the lower end of the bone there is considerable prominence of 

 the muscular attachments and some irregularity of the cartilage 

 on the capitellum. W. C. H. 39. 



7. 190. Advanced Arthritis Deformans, with great 



Atrophy of the Humerus. — Left humerus and scapula — 



macerated, to illustrate the above. 



The shaft of the humerus from the attachment of the 

 deltoid upwards is curved outwards, and is flattened from within 

 outwards, i.e. the reverse direction to the flattening in a rickety 

 curve. (There is, however, one ridge in this concavity which 

 partly corresponds to the visual development of bone in the con- 

 cavity of the arch.) The outer lip of the bicipital groove is 

 prominent below, but the inner lip can hardly be recognised 

 anywhere. The head of the bone is wanting, having apparently 

 been absorbed, and what represents the articular surface is 

 irregular and at places eburnated. At the upper margin of what 

 represents the head, there is an irregular projection of bone, as 

 in the two previous specimens. The glenoid cavity of the 

 scapula has been absorbed at its central parts and towards the 

 back, while a thick ridge of bone has been thrown out all round 

 the margins, especially above and below. The cavity thus 

 deepened and enlarged resembles an imperfect acetabulum. 

 The surface is irregular, being at places both porous and 

 eburnated. When the bones are articulated, the upper part of 

 the humerus, as in the previous specimen, comes close under- 

 neath the acromion process. 



G. C. 1193. 



Presented by Fi-ofessor James Kussell. 



