258 DADD'S VETERINARY MEDICINE AND SURGERY. 
ith thread, pass a bistoury under it, as near to the upper angke 
of the section as possible. The violent spasm vhe division of the 
uerve produces may be somewhat lessened by pressing the nerve 
between the finger and the thumb, when an opportunity may be 
taken, either with the scalpel or scissors, of dividing it; thea, 
taking hold of the lowermost portion between a pair of forceys, 
excise about three-fourths of an inch of its trunk. Having fin 
ished, if both feet are affected, proceed to operate on the contrary 
gide of the other leg; after which turn the horse, and repeat the 
operations on the like parts of each leg as they come in succession. 
The integuments may be now drawn neatly together, and secured 
by a twisted suture, the whole being properly covered by a light 
ecmpress. Tie up the head for a day or two, after which put on 
acradle. Keep the horse very quiet and low; give mashes, to 
open the bowels; but we should avoid physicking, from the fear 
that griping might occur, which would make him restlee- r prob- 
ably require exercise. 
PeRIosTEOTOMY (REMOVING A TUMOR FROM SURFACE OF Bone). 
This operation consists in having the horse thrown upon hia 
side, and the leg to be operated upon released from the hobble, 
and extended upon a sack, filled with refuse hay or straw. This 
is done by means of a piece of webbing passed round the hoof, and 
the end given to 4 man to hold, who puils rather violently at the 
member. The operator then kneels down and feels for the exos- 
tosie he intends to perform periosteotomy upon. This may be a 
splint or a node, and commonly exists upon the metacarpal portion 
of the fore-limb. The operator having found the excrescence, snips 
just below it with a pair of rowelling scissors. He then takes a 
blunt seton-needle and drives it through the cellular tissue, and 
immediately over the enlargement. Next, another slit in the 
skin, above the exostosis, is made with the rowelling scissors, and 
through this last opening the point of the seton-needle is forced 
and then withdrawn. Into the free space thus made a curved 
knife is introduced. The point of this knife is blunt, and the 
blade curves upward, the cutting part being below. Some per- 
sons use a very diminutive blade, but the editor prefers a rather 
large instrument, as being more under the command of the hand. 
Having introduced this knife, he turns the cuttire edge ‘ownward, 
