AN/ESTHETIC INHALERS. 



31 



The first apparatus is so devised that it allows six or eight 

 drachms of chloroform to be placed in the bottle ; by means 

 of the bellows a current of air is sucked over the surface of the 

 anaesthetic, the mixed vapour being forced onwards into the 

 mask (Fig. 14). 



When eight drachms are in the bottle and the temperature 

 of the air about 60° Fahrenheit, each full compression of the 

 bellows sends over chloroform vapour well mixed with air in 

 the proportion of about i in 2500. In order to produce 

 anaesthesia, the bellows must be worked as hard as possible, 



Fig. 14. 

 Diagram of author's anaesthetic inlialer (first pattern). 



the end of the mask being closed at the discretion of the 

 anjesthetist. 



With strong dogs of the larger breeds it is sometimes 

 necessary to assist anaesthesia by placing a little chloroform 

 on wadding in the end of the mask. For very delicate or 

 young animals the vapour can be very much more diluted, 

 either by putting less chloroform in the bottle, by only partially 

 compressing the ball, by regulating the amount admitted by 

 means of the tap, or by leaving the end of the mask uncovered. 



The second pattern, known as Junker's, which has been modi- 

 fied to suit the smaller animals by Messrs Krohne & Sesemann, 



