LAMENESS, FROM VARIUUS 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. 
Exp Lanation—1 11, Articulating surface of the lower or inferior part of the thigh bone occurs 
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 iower 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 « 
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 lamine and cartilagi. 
nous braces will have been decomposed or dissolved, so that the 
bone looks like fibrous net-work. In most cases, the vacuities 
