Canine and feline surgery .. . inhaler are, that only the vapour comesin contact with the patients nostrils (there being thus no fear ofirritant effects), the anaesthetic is well mixed with air in tolerablyconstant proportions before being breathed, the amount allowedcan be adjusted with great delicacy, and the risk of overdose isthus minimised ; the quantity, too, of chloroform used is con-siderably less, as the amount wasted is exceedingly small. AN/ESTHETIC INHALERS. 31 The first apparatus is so devised that it allows six or eightdrachms of chloroform to be placed in the bottle ; by meansof
Canine and feline surgery .. . inhaler are, that only the vapour comesin contact with the patients nostrils (there being thus no fear ofirritant effects), the anaesthetic is well mixed with air in tolerablyconstant proportions before being breathed, the amount allowedcan be adjusted with great delicacy, and the risk of overdose isthus minimised ; the quantity, too, of chloroform used is con-siderably less, as the amount wasted is exceedingly small. AN/ESTHETIC INHALERS. 31 The first apparatus is so devised that it allows six or eightdrachms of chloroform to be placed in the bottle ; by meansof the bellows a current of air is sucked over the surface of theanaesthetic, the mixed vapour being forced onwards into themask (Fig. 14). When eight drachms are in the bottle and the temperatureof the air about 60° Fahrenheit, each full compression of thebellows sends over chloroform vapour well mixed with air inthe proportion of about i in 2500. In order to produceanaesthesia, the bellows must be worked as hard as possible,. Fig. of authors anaesthetic inlialer (first pattern). the end of the mask being closed at the discretion of theanjesthetist. With strong dogs of the larger breeds it is sometimesnecessary to assist anaesthesia by placing a little chloroformon wadding in the end of the mask. For very delicate oryoung animals the vapour can be very much more diluted,either by putting less chloroform in the bottle, by only partiallycompressing the ball, by regulating the amount admitted bymeans of the tap, or by leaving the end of the mask uncovered. The second pattern, known as Junkers, which has been modi-fied to suit the smaller animals by Messrs Krohne & Sesemann, 32 CANINE AND FELINE SURGERY. allows a stream of air to be forced through a quantity ofchloroform, and so sends into the mask the vapour of air andchloroform mixed (Fig. 15). With this it has been estimated that (at a temperature of62 Fah.) with eight drachms of chloroform in the bottle, eachfull com
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