SERUM THERAPY 109 



any difficulty is experienced in starting the flow 

 of antitoxin, the operator may blow gently in 

 the top of glass tube containing the cotton filter. 

 The physician is enabled to observe, by means 

 of the short glass tubing near metal tip of rub- 

 ber tubing, the instant that all of the antitoxin 

 has been introduced; and thus air can be pre- 

 vented from being forced into the spinal canal. 



When the desired amount of antitoxin has 

 been introduced, the needle with the attached 

 glass cylinder is rapidly withdrawn and the 

 puncture wound is sealed with collodion. 



Note : This equipment may also be used for 

 the intravenous administration. 



