DISEASES OF THE BONES 389 
check, any large formation of new bone is prevented, and 
the case does well. 
When the case is complicated by a wound, then anti- 
septic measures, such as those described in the treat- 
ment of punctured foot, will at the same time have to be 
practised. 
It must be admitted, however, that in all but the most 
simple cases ordinary treatment such as this is of very 
little use ; for with only a slight exostosis in almost any 
position in the foot, excessive lameness presents itself and 
remains. In such cases nothing is left to us but the 
operation of neurectomy. 
When the periostitis and ostitis is the result of a wound, 
and is complicated by caries or necrosis of the bone, the 
diseased portion of bone must in every case be laid bare 
and removed. It so happens that the majority of cases of 
this kind occur in positions where the diseased bone is 
easily got at. The lower margin of the os pedis or portions 
of the wings are commonly the seat of such changes. We 
meet with the former in cases of pricked foot, and with the 
latter in severe cases of tread, or as a complication in sup- 
purating corn or in quittor. In such cases the animal must 
be cast and the foot secured. The wound is then followed 
up, the horn if necessary removed, and the bone curetted 
with a Volkmann’s spoon ; or, if showing itself as a seques- 
trum, removed with a scalpel and a strong pair of forceps. 
Care must be taken that every particle of the diseased bone 
is removed, and that no part of it is left to act as an after- 
source of irritation. With removal of the diseased portion 
and a strict attention to antisepsis healing soon takes 
place. 
Reported Cases of Periostitis and Ostitis.—1. ‘ Figs. 150 
and 151 represent the phalangeal bones of the off fore-leg 
of a thoroughbred horse named Osman, who was well 
known as a hunt steeplechaser of considerable merit in the 
Midland counties some twenty years ago. I may say that 
this horse was under my observation pretty regularly during 
the whole of his career, and up to the time of his death, 
