150 Roaring in Horses. 



16. Electric-lamp, to illuminate the interior of the 

 larynx. Mr. Raymond has introduced a most useful lamp 

 for this purpose (Fig. 19). It is bent at an angle within 

 about two inches of the end of the handle, and a shield 

 fits upon this part ; the front of the shield, being plated, 

 forms a reflector ; while the back is covered with vulcanite, 

 which, lying against the tissues, protects them. The 

 advantages of this lamp are the excellent light it throws 

 upwards into the larynx and pharynx ; it may remain in 

 the trachea for a long period without doing any injury, 

 while it hangs into it by its bend, and does not require to 

 be held by the hand.^ 



Fig. 19. 



A bucket containing a ten per cent, solution of common 

 salt or borax should also be ready. 



Operation.— The horse should be well fed for a day or 

 two before the operation, but have little or nothing to eat 

 or drink for some hours before being operated upon. In 

 the case of thoroughbred horses, Mr. Raymond thinks it 

 advantageous to administer four ounces of tincture of 

 opium in a pint of water half an hour before operating. 

 The hair must be removed closely from around the upper 

 part of the trachea and larynx before the horse is cast. 



1 All the instruments and apparatus are made by Arnold and Sons 

 surgical instrument makers, West Smithfield, London. ' 



