POLL- EVIL. 579 



volved, they must be scraped ; ' next, a depending opening made 

 by running a seton from the bottom outward. Sometimes the mat- 

 ter extends across the neck to the opposite side. In such a case, 

 the best way is to run a needle across between the muscles, and out 

 on the opposite side, making an outlet on both sides. 



The after treatment is the same as for fistula of the withers, be- 

 ing careful to remove all foreign growth, or diseased bone. Dress 

 first with slightly caustic solution, 

 then with digestive ointment, as 

 explained. 



I will include here a remedy 

 which is claimed to be very ef- 

 fectual in the cure of poll-evil, fis- 

 tula of the withers, etc. v Burn corn- • ,. '%£■* " :: J£St^f% " '\\ 

 cobs, and fill the cavity to the bot- ^fHU ^wtKr^Hm f 

 torn with the ashes. It may be 

 necessary to repeat two or three 

 times before a cure is effected. 



The ease with which this can be 



... . t , , . , Fig. 891.— Showing Seton. 



applied makes it worthy of trial. 



The following remedy is used by veterinary surgeons of my 



acquaintance as a remedy of great value, and is kept a secret. The 



point in using it is, to saturate a little tow with it, and push it to 



the bottom of the ulcer, so that it will touch every part of it. In 



about twenty-four hours the diseased part can be separated from 



the heajthy flesh with the finger, from the top to the bottom, and 



taken out, when it is to be dressed as a simple wound : — •* 



Acetate of copper (verdigris) ^ 4 oz. 



Sulphate of copper'(blue vitriol) ' . I 4 oz. 



Alum. . . , 4 oz. 



White precipitate (white mercury) , 1 oz. , 



Nitric acid. 2 oz. 



Honey.... .. v . 1 lb. 



DISEASES OF THE EYE. . 



. ■ 'V' 



The eye, or Organ of vision, is composed of three tunics, or 

 coats, and of the same number of .humors. To'the external coat 

 (sclerotic and cornea) it owes its form. The middle tunic is made 

 up of the choroid, or vascular, coat of the iris, or the thin curtain 

 suspended in the aqueous humor, and perforated in the center by 

 an opening called the pupil, or pupillary opening, .which in the 

 horse is of an elliptical form ; in man it is round. The inner coat is 

 called the retina, or nervous covering, and is the terminal expansion 

 of the optic nerve. 



