CASTRATTON OF FEMALES 



91 



subjet't crowded back to assume a position in close 

 contact with the cross bar, precluding the elevation 

 of the hind legs wliich might endanger the operator and 

 injure the animal as well. The subject should be pre- 

 vented fr-om lying down by means of girths, and a rope 

 or strap should l)c passed over the back. 



Fig. 16— A FORM QF HIPPO-LASSO 

 Illustrating a suitable mode of restraint for vaginal oophorectomy of the 

 mare by means of a form of hippo-lasso as employed by the author. 



Preoperative Preparation and Technic. — The ex- 

 ternal perineal region is then scrubbed with soap and 

 ^\-;iter, and the vaginal canal irrigated with a one-half 

 of one per cent solution of lysol. Pledgets of cotton 

 may be used to swab out the vaginal canal, though 

 this is not imperative. 



The introduction ol' water in the vaginal canal stimu- 

 lates a ballooning of its walls. This is a normal physio- 

 logical function vested in this structure and makes 



