..462 VETERINARY SURGICAL THERAPEUTICS. 
Dony lesions, bringing with them more or less extensive mortification ; lead 
. and phosphorus poisoning must have the same nocive action in animals 
- as in man, but facts to this effect are wanting. . 
The size of the seguestrum varies much. Sometimes it is but a very 
small piece of bone, or even small fragments (parcellar necrosis) ; in some 
-casés (panosteitis) mostly the whole bone is affected. Sequestra are 
exposed or invaginated. The museum of Alfort contains several specimens 
--of invaginated scapula. We have seen two beautiful ones in Lyon. On 
-a horse affected with comminuted fracture of the scapula, Chuchu extracted . 
first a few splinters, then after two or three months, a sequestrum from the 
- anterior angle of the bone. In the observation of Barrier and Gervais, 
it was a mare which had received a kick on.the anterior border’ of the 
’ right shoulder, about twelve centimeters above the shoulder joint ; a blister 
was applied and the patient put to rest ; the lameness, first slight, increased 
‘little by little ; extremely serious symptoms became manifest, the animal 
--dropped in the slings and was killed. The necrosed scapula was covered 
‘with an osteo-cartilaginous envelope of new formation. Jacquot has re- 
ported the case of a yearling colt, convalescent from distemper, which 
received a kick on the superior part of the forearm; the fistulous wound 
‘that followed was treated by blistering and antiseptic injections; an 
enormous swelling occurred with other numerous fistulas from which 
? escaped an abundant suppuration. He was destroyed. At post-mortem 
an extensive necrosis of the radius was found with sequestration of the 
mecrosed portion. . Jee 
If all denuded bony surface is predisposed to -fecrosis, infection 
plays with it the primordial part. A piece of bone, deprived of cir- 
‘ culation, but aseptic, is tolerated by the tissues; it-does not promote 
-suppuration, it may become grafted, and the characters of this asep- 
tic necrosis are very different from those of infectious mortifications. 
Therefore, as soon as a bone is exposed, isolated from its periosteum, 
it must, after minute disinfection, be covered with an antiseptic prep- 
aration (iodoformed, phenicated or boricated vaseline), which prevents 
its desiccation and protects it from external agents. 
When mortification exists, the treatment includes four indications; rst, 
‘hasten the limitation of the necrosis ; 2d, favor the elimination; 3d, pre- 
vent infections; 4th, activate the repairs. When necrosis has affected 
but a very limited and superficial surface, as is seen frequently with some 
bones, simple antiseptic injections are sufficient to prevent all complica- 
‘tions ; by the local reaction alone, the sequestrum is eliminated and the loss 
of substance is rapidly filled up. In bygone days, escharotics and caus- 
tics were frequently used ; some exclusively employed tincture of iodine. 
or Villate solution in injections through the’ fistula; others cauterized it 
