OPERxVTIONS. 



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Scions. 



These consist of tape, threads, or 

 lamp cotton i)assed under the skhi, and 

 smeared with di<T;estive ointment. * 

 The instrument emjjloyed for conveying 

 tliese under the skin is named a seton- 

 needle, and may be purchased at the 

 instrument makers. When lamp cotton 

 is used it can be withdrawn gradually, 

 thread by thread, which on some occa- 

 sions is desirable. Setons are preferable 

 to rowels, being more convenient and 

 equally efficacious. 



[The frog seton, recommended for 

 the navicular disease, may be inserted 

 through the heel, the horse being either 

 thrown or in a standing posture. I 

 generally insert it standing. The twitcli 

 being applied, the foot to be operated 

 on must be held up by an assistant. 

 I then plunge the curved seton-needlo 

 into the heel, with a second effort bring 

 the point out at the cleft of the froo-, 

 ^ which lias been previously thinned for 

 ^ the purpose, and by a third effort draw 

 "I it through, after which knots are tied 

 1^ at each end of the taj)c, which may 

 ►^ be rendered thicker by means of tow. 

 "When the horse is thrown it is more 

 convenient to insei't the seton in a 

 contrary direction, viz. from below up- 

 wards. The seton should be kept clean, 

 occasionally dressed, diminished, in the 

 course of three weeks, and removed a 

 week or two afterwards. — Ed.] 



* Mr. Moi-ton recommends the tape or cotton 



to be saturated with the following mixture : 



" One part of powdered cantharides is to be 

 digested with a gentle heat for fourteen days iu 

 eight parts of oil of turpentine. The solution 

 being fihered, an equal portion of Canada balsam is added. The tape or 

 cotton to be drawn between the finger and thumb and dried." When this 

 is used digestive ointment is not requu-ed. — Ed. 



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