236 PRINCIPLES OF VETERINARY SURGERY 



chloroform one part. In the large medical colleges, where 

 a large number of dogs are anaesthetized for experimental 

 operations, chloroform is in quite general use. The fatali- 

 ties are, however, too numerous, while with ether they are 

 quite rare. Ether in the dog and cat very seldom cause 

 cardiac syncope, while chloroform always seems to kill by 

 that method. Ether may provoke arrest of the respirations, 

 but in the great rpajority of cases if the accident is observed 

 promptly^ resuscitation is generally successfully accom- 

 plished by artificial respirations. 



In these animals a specially improvised apparatus is rec- 



FiG. 30. 



1. Perten's Method, of Administering Anaesthetics to Dogs. 2. The 



Apparatus Taken Apart. 



ommended. A leather cone to fit the nose, supplied with a 

 strap to fasten it around the poll, a wire screen within to 

 prevent the sponge from touching the nose and a re- 

 movable and perforated end to hold the sponge, is the most 

 practical apparatus (Fig. 30). The operation begins with 

 two to five drams of ether (according to the size of the ani- 

 mal) applied to the sponge, which is then placed into the 

 removable end of the cone just before the latter is adjusted 

 to the apparatus, which has previously been attached to 

 the subject!s head. The patient is held or tied firmly until 

 the anaesthetic stage is reached ; then a relaxed state of the 



