72 



MEANS OF BESTEAINT. 



Fia. 68.— Gresswell's Cailoro- 

 form Nose-Bag. 



Fig. 69.— Carlisle's Chloroform Inhaler. 



"While it has often been induced by the inhalation of a single 

 ounce, there are cases in which two, three, or even more have 

 been necessary. An essential point to consider is that the 

 chloroform should be absolutely pure. Mixtures of two or more 

 drugs have also been employed, usually ether and .chloroform, 

 with or without the addition of alcohol, but the result of all ex- 

 perimental tests has been, with us, to establish the conviction, 

 that as yet, chloroform used singly has proved itself to be the 

 most effective and the safest of all. The administration of 

 chloroform of course pre- supposes, besides all the other conditions 

 and preliminaries of an operation, such as previous fasting, the 

 preparation of the bed, and other incidental steps, the act of 

 throwing the patient. 



When the effects of the inhalations begin to become manifest, 

 the first physiological change noticed is an extreme agitation, 

 accompanied with coughing. The animal struggles more or less 

 violently, the irritation and tickling of the throat produced by the 

 vapors upon the laryngeal mucous membrane, giving rise to a 

 spasmodic motion of the glottis, and whether the patient be a 



