Plate 10. 

 I have been induced to add this plate in consequence of 

 meeting with the foot, represented in Fig. 1 ; it presents 

 such an admirable illustration of the eflect of shoeing and 

 stabling upon the frog and elastic cushion, that I could not 

 resist the imj^ulse to draw it, and place it by the side of the 

 young foot, already represented in Plate 2 ; and having done 

 so, I was further led to add a sketch of the interior of the 

 hoof, in the hope that bringing the three figures under notice 

 at one view might enable me to point out more clearly, what 

 changes have taken place, and how they have been brought 

 about. Upon a careful comparison of Fig. 1 with Fig. 2 we 

 shall be struck among other thmgs with the great difference, 

 observable in the bulk of the elastic cushion or fatty frog in 

 the two feet both in the heel at h, and in the portion immedi- 

 ately between the navicular joint and the horny frog at c. I 

 found however a difference in the quality or texture of this 

 part in the two feet of far greater importance, than any 

 diminution of quantity ; for, while Fig 2 presented a substance 

 resembhug throughout its whole extent a mixture of fat and 

 tendon, and yielded to pressure from the point of a knife 

 without being pierced by it, that is, sunk away before it, the 

 corresponding part in Fig. 1 was of a close, imyielding texture, 

 offering the resistance of firm gristle, and instead of sinking 

 away from the point of the knife, resisted it with a grating 

 sound : indeed I could perceive no difference between the soimd 

 produced by passing the point of the knife over this substance, 

 and over the horny fi'og. I have attempted to mark, where 

 the change of structure commences, by a variation in the touch 

 upon the stone, by which it will be seen, that the texture 

 of the substance at h is pretty much the same in each foot, 

 notwithstanding the great disproportion there is between their 

 respective quantities. In Fig. 1, where it has suffered under 

 bad treatment, and is wasted and dwindled to almost nothing, 

 it soon assumes a close, firm texture as it descends from b 

 towards e, until (all its soft parts having been absorbed) it 



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