NAVICULAR DISEASE. 337 



place, the muscles of the shoulder and arm waste away, and 

 what some people call 'sweeney' is now present, but there 

 is not the well-marked atrophy of shoulder-slip. There is 

 more or less atrophy of the pectoral muscles, and a falling 

 in of the chest. On a careful examination being made, 

 the toe of the shoe on the affected foot will be found 

 worn in a much greater degree than its fellow of the 

 sound limb, on account of the animal going upon the 

 toe of the foot affected. In most cases an abnormal 

 degree of heat can be detected in the region of the 

 coronet. A hammer may be employed to tap gently on 

 each side of the frog in the region of the bars, when usually 

 the animal' will evince pain by flinching, and endeavour 

 to get the foot away. Pressure upon the perforans tendon 

 while flexion and extension of the parts are performed will 

 cause the animal to show uneasiness, and in many cases 

 manifest considerable pain. Immediately after this he 

 should be caused to trot, when the lameness may be ob- 

 served to be greater than before. When standing, if both 

 feet are aff*ected, the animal keeps continually shifting his 

 weight from one side to the other, and often so great is 

 the pain that, on being left to himself, he immediately 

 lies down, and will scarcely stand up long enough to take 

 his food. In such a case he gradually falls off" in flesh, 

 and plainly shows that he is sufi'ering pain of a most 

 agonizing character. Occasionally a case may be met with 

 in which there is no atrophy of the foot perceptible, and 

 the animal yet be a confirmed cripple from the disease. 

 A peculiar trembling motion of the limb is often seen, being 

 best observed when the animal is standing at rest; and 

 in a confirmed case, when he is made to move, he does so 

 w^ith a sort of uncertain action, a trembling and a general 

 appearance of weakness of the limbs, which, together with 







