HYDROCYANIC ACID AS AN ANTirK)Tl';. 



39 



which it so rapidly causes when given to produce toxic 

 effects, and when used as an antidote the object must be to 

 give just sufficient to attain a temporary stimulating effect on 

 the respiratory centre without causing over-stimulation and 

 consequent arrest. Its rapidity of action is unquestionable, 

 and it can be given either subcutaneously or by the mouth. 

 With the former there are no local irritant effects as a sequel ; 

 and with the latter there is no danger of any entering the 

 trachea and producing choking, because the dose is so small. 



Fig. is. 



Antidote drop-tube and bottle for hydrocyanic acid. 



The method of administration which is advised consists in plac- 

 ing a small quantity by the aid of a drop-tube on the back of 

 the tongue, from whence it is absorbed readily by the moist 

 mucous membrane. A full medicinal dose should be given, 

 Scheele's acid acting quicker than that of the British Pharma- 

 copeia strength, although, of course, it must be used with 

 greater caution, one reason being that the evanescent vapour 

 is drawn into the lungs by the performance of artificial respira- 

 tion and is thus more rapidly absorbed into the system. 



