DISEASES OF THE JOrN"TS. 



EXPLANATION OF PHOTO-LITHOGRAPH, PLATE XL 



1. Eheumatoid Inflammation op Shoulder- Joint, showing por- 

 cellaneous condition of articular surface, and ossification of synovial 

 fringes. (1.) Extremity of scapula. (2.) Upper end of humerus. 



2. Scrofulous Disease of Elbow-Joint op Ox, the lower ex- 

 tremity of humerus being shown. (1.) Tubercular deposits repre- 

 sented by the white spots. (2.) Destructive absorption of the cartilage 

 and bone. 



3. Eheumatoid Disease op Stifle- Joint, showing — (1.) Grooving 

 of the bone, and the porcellaneous deposit ; and (2.) The formation of 

 the addimentary bones described in the text. 



4. Eemoval op Articular Cartilage and Compact Lajiinal 

 Layers from the surfaces of tibia and astragalus in a case of open 

 joint. (1.) 'New ossific deposit external to the articulation. (2.) Por- 

 tion of laminal layer not yet removed, but which in the specimen is 

 " tunnelled under " by absorption. (3.) Lower end of tibia; which 

 at (4.) contains a pit-like ulcer. 



5. Hock- Joint in Eheumatoid Bog-Spavin. (1.) Grooving of arti- 

 cular surface into which the porcelain is deposited. (2.) Addimentary 

 bones, formed by ossification of the synovial fringes. 



6. Fracture of Astragalus and Bone-Spavin. (1.) Astragalus. 

 (2.) Bone-spavin. (3.) and (4.) Metatarsal bones. 



7. Caries op the Point of Os Calcis (Capped Hock). (1.) Sup- 

 erior, and (2.) Inferior extremities of the bone. 



8. Scrofulous Inflammation of the Phalangeal Bones op Ox 

 in " Foul in the foot. (1.) and (2.) Show the contrast between an 

 ulcerated and healthy articulation. It avUI be noticed that although 

 the destructive process is much advanced, there is but little or no 

 attempt at repair by external deposition of bone. 



9. Tubercular or Scrofulous Inflammation op the Foot op 

 a Cow, commonly called " foul." At (1.) and (2.) are well-marked 

 collections of " yellow tubercle." . 



