116 Improved Instrument for J^enous Injection. 



cholera ; nor will this application be limited, it is conceived, exclu- 

 sively to this disease, but may become eventually a beneficial adju- 

 vant in other diseases, which (resisting the ordinary methods of treat- 

 ment) would otherwise be abandoned to the powers of the fell de- 

 stroyer. 



Annexed is a plan of the apparatus proposed, which consists simply 

 in the addition of a silver inserting tube and a glass air chamber to 

 the "Improved domestic instrument of Maw," (with which every 

 practitioner and private family is or ought to be supplied) or to the 

 more complicated stomach and injecting pumps of Read and others. 



J\Iethod of use. — Adapt the whole as illustrated on the plate, then 

 (the pump being placed in the liquor to be employed, the stopcock 

 freely opened, and the tube inclined upwards) by a few strokes of 

 the piston, the expulsion of all the air is thoroughly effected, as will 

 be evinced to .the operator by the uninterrupted, silent jet. Having 

 now the air-chamber nearly, and the remainder of the apparatus com- 

 pletely filled with the liquid, close the stopcock so as to allow but a 

 ' guttatim' emission, and insert with care the extremity of the tube into 

 the vein previously prepared for its reception. 



The contained fluid being under compression and constantly flow- 

 ing from the point of the instrument during its introduction, all admis- 

 sion of air into the vessels is thereby effectually excluded. Another 

 advantage arising from the stopcock, which should be noticed, is the 

 perfect regulation of the current during the process of injecting. 



TO THE EDITOR. 



Postscript. Providence, Septemher 17, 1832. 



Sir — In a communication made to you for insertion in your Jour- 

 nal on the 14th inst., I forgot to state, that I have occasionally tip- 

 ped the points of the inserting tube with a lulb (say half a line in 

 diameter) which, from its exciting less irritation in the vein, I prefer 

 to the oblique point as presented on the plate. I would also state 

 that I have purposely omitted the metallic slide or guard to prevent 

 the reflux of the liquor and flow of blood from the orifice, preferring 

 rather the application of the finger of the operator for that purpose. 



