LAMENESS, FROM VARIOUS CAUSES. 



365 



of disease, only located in different parts. When the upper jaw 

 becomes the seat of affection, an enlargement of the facial bones 

 will be observed, and the examiner's attention will be attracted by 

 the unnatural appearance of the face. As the disease progresses, 



ARTICULATING SURFACE OF THE THIGH BONE. 



Explanation— 1 J X, Articulating surface of the lower or inferior part of the thigh bone occur- 

 ring in the disease known as Osteo Porosis, or Big Head. » 



the face looks more like that of an elephant than a horse ; and now, 

 the disease being incurable, the subject should mercifully be put 

 out of his misery. The enlargement of the lower jaw is discov- 

 ered by manipulation. On removing the skin from the sides of 

 the face of such a subject, and dissecting the muscles and perios- 

 teum (covering of bone), the bones appear to have undergone a 

 softening process, and particles can be separated by means of the 

 finger-nails. At the same time, if a transverse section of any of 

 the shaft-bones be made, they will be found to have undergone 

 structural changes. For example, they will not only appear soft- 

 ened, but honey-combed, and many of the laminae and cartilagi- 

 nous braces will have been decomposed or dissolved, so that the 

 bone looks like fibrous net-work. In most cases, the vacuities 



