POLL EVIL OPERATION. 41 



serted into the trachea tube while the chloroform is dropped 

 on a towel spread over its mouth. After completing any 

 required operation on the septum, turbinated bones or other 

 parts, hemorrhage may be controlled by plugging one or 

 both nasal fossae with single strips of gauze of sufficient 

 size and carefully securing them by sutures to the sides of 

 the trephine wound or otherwise. 



6. POLL EVIL OPERATION. 

 Plate viii. 



Instruments. Clipping shears, razor, sharp scalpels, 

 probe-pointed bistoury, probe, Luer's bone forceps, bone 

 gouge, curette, suture and dressing material. 



Technic. Confine the animal in lateral decubltis prefer- 

 ably upon the operating table, place under complete anaes- 

 thesia and remove the halter or other headgear. 



Clip the foretop and mane and shave the forehead and 

 the top of the neck back to a distance of 8 or 10 cm. or as 

 much farther as may be required to pass beyond and be- 

 hind the supposed extension of disease, and disinfect the 

 area. With sharp scalpel make a "longitudinal incision 

 on the median line of the head and neck beginning at a 

 point presumably posterior to the diseased area and carry- 

 ing it over the poll down onto the forehead for a distance 

 of 4 or 5 cm. below the foretop. Continue this incision 

 through the skin, the subcutem, the adipose tissue, AT, 

 Plate VIII and either through or passing around alongside 

 the neck ligament, LN, into the diseased area beneath the 

 latter. Dissect the ligamentum nuchse away from the ad- 

 joining tissues as far back as diseased and divide obUquely 

 upward and backward as indicated at AA, and detach 

 anteriorly from the base of the occiput. Be careful to re- 



