POLL EVIL OPERATION. 37 



the chloroform is dropped on a towel spread over the mouth 

 of the fiiimel. After completing any required operation on 

 the septum, turbinated bones or other parts, hemorrhage 

 may be controlled by plugging one or both na^al fossa with 

 single strips of gauze of sufficient size and carefully se- 

 curing them by sutures to the sides of the trephine wound 

 or otherwise. 



6. POLL EVIL OPERATION. 



Pl,ATE VII. 



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 decubitis preffer- 

 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 bad? to a distance of 8 or lO cm. and behind the sup- 

 posed extension of disea.se, and disinfect the area. With a 

 sharp scalpel make a longitudinal incision on the median line 

 of the head and neck beginning at a point presumably posteri- 

 or to the diseased area and carrying it over the poll down onto 

 the forehead for a distance of 4 or 5 cm. below the foretop. 

 Continue this incision through tlie .skin, the .subcutem, the 

 adipose ti.ssue, AT, Plate VII, and either through or passing 

 around along.-^ide the neck ligament, LN, into the di.sea.sed 

 area beneath the latter. Dissect the ligamentum nuchse 

 away from the adjoining tissues as far back as disea,sed and 

 divide obliquely upward and backward as indicated at AA, 

 Plate VII and detach anteriorly from the base of the occiput. 

 Be careful to remove every portion of the ligament in the 

 area indicated and remove all calcareous deposits or disea.sed 

 tissues. With Luer's forceps groove a channel about 2 cm. 

 wide from behind to before through the occipital protuber- 



