PLATE I, 

 (FORMING THE FRONTISPIECE). 



RHEUMATIC INFLAMMATION OF THE HOCK JOINT. 



Plate I, represents one of the hocks, with its joint laid open, of the mare that 

 died of disease of the valves of the heart, whose case (so far as it has reference 

 to this disease of joint) is given at page 43. The joint contained one ounce 

 and a half, by measure, of synovia, of a deep amber colour. And the synovial 

 membrane (as seen in the Plate) in every part, save where it was reflected upon 

 the bones, presented a coating of coagulated lymph, one-fourth of an inch in 

 thickness, having the same (amber) tinge as the synovial fluid; by which, 

 indeed, it appeared to be saturated. Here and there, streaks and patches of 

 red were to be seen upon this adventitious lining of the joint, marking the 

 commencement of vascular action within its substance. By comparing this 

 diseased joint with a hock, in these respects, healthy (such as is represented in 

 Plate II), the difference in aspect will at once become manifest. 



