EOWEL SETON. 197 



The shoe being removed, and the sole and frog pared down 

 and made as thin as possible, either an incision may be made 

 in the hollow of the heels, or the needle inserted without it 

 through the skin, in such a direction as to have its point emerge 

 at about the front part of the middle commissure of the frog. 

 The tape is drawn into position by pulling the instrument straight 

 away thi'ough the opening of exit. The seton is to be secured by 

 tying ends together. When the operation is performed while the 

 animal is standing, a strong assistant must hold the foot, and the 

 needle pushed and passed through the frog rapidly, as by possible 

 struggles, severe injuries of the tissues of the posterior part of 

 the foot might result. 



Rowel Seton. 



This form of exutory is of earlier origin than the ordinary tape 

 seton, and consists in a round piece of leather, felt or pasteboard, 

 sometimes pei^forated in its center, which is deposited in a pouch 



Fig. 224.— Rowol Seton. 



made under the skin, either simple, or sometimes surrounded 

 with a band of tape to prolong its continuance. It is principally 

 used when the disposition of the parts renders the introduction of 

 a tape seton difficult, or when it is for any reason contra indicated, 

 and especially when the exutory being indispensable to the well 

 being of the patient, it is at the same time imperatively required 

 that the animal shall be preserved free from any blemish or dis- 

 figurement. It is also to be preferred with animals which cannot 

 be prevented from tearing out the ordinary tape seton with their 

 teeth. 



A pau' of scissors and a straight bistomy are required for its 

 insertion. A simple incision is made with the bistoury, long enough 



