S46 



DISEASES OF THE FEBV. 



the inflammatQry^ action,- its vessels are injected; its surface 

 presenting^ a^red;,BtreQky. appearance; it becomes slightly, bvtu 



Fig. 63. Fig. 64. 



.Fig. 63 shows the gradual ejection'of the tissues of the cartilage p.t the ulcerated 

 spots. In the centre of the hollow the superficial parts of the cartilage have disap- 

 peared, and the deeper parts are undergoing degeneration, becoming irregular, 

 shrivelled, losing their walls, and discharging their contents. — (After Redtern.) 



Fig. 64. — Vertical section of cartilage, showing the notches produced by burst- 

 in<t of the cello, and the fibrous and granular mass on the free surface.^ — (Redfehn.) 

 This figure very fairly illustrates the change in the navicular cartilage at an 

 early stage of its conversion into a finely granular calcareous substance. 



j=5^3^-.,^g*-jg5j,>^-~,j never much thickened; in very 



chronic cases its free surface 

 becomes involved in the gene- 

 ral adhesive process, and united , 

 to the tendon and bone. 



The changes in the cartilage 

 are the same as when the carti- 

 lage of incrustation is inflamed 

 in an articulation' (see Chapter 

 XI.) ; it is either removed from 

 the surface of the bone by ulcera- 

 tion, or converted into fibrous- 

 tissue or a calcareous material. 



The supposition that the sur- 

 FiG. 65 chows tha cupcr^ici:!! cells of face of this Cartilage is naturally 



the cartilage enlarged, and passing into a g^j ^ ^ membrane is UOt 



granular and fibrous mass on thB suriace. •/ . . 



borne out by microscopic inves- 

 tigation ; the supposed membrane being nothing more than 

 the cartilage corpuscles, which are flattened up'on the fre6 sur- 



