744 



PASSIVE IMMUNIZATION SERUM THERAPY 



better injected by the gravity method, the simple apparatus shown in 

 Fig. 140 being quite satisfactory for the purpose. This consists merely 

 of a graduated cylinder, which serves as a mea uring funnel, rubber tub- 

 ing with a pinch cock, and is furnished with a metal tip that fits the 

 needle. The needle should be of proper size, and have a sharp but some- 

 what short beveled edge. It may be curved, as shown in the illustration, 

 or may be straight. The apparatus shown in Fig. 146 is adapted 



FIG. 139. METHOD OF MAKING INTRAVENOUS INJECTION BY MEANS OF A SYRINGE. 

 This syringe was devised for the intravenous administration of a concentrated 

 solution of salvarsan. It is provided with a three-way cock, which permits drawing 

 fluid into the syringe and then injecting it into a vein. This injection may also be 

 given by any glass syringe; the particular advantage of this one is that the opera- 

 tor may inject more than one syringeful of fluid without removing the needle. The 

 same syringe may be used for the intravenous injection of any serum, as diphtheria 

 and tetanus antitoxins. (Apparatus made by B. B. Cassel, Frankfort, Germany.) 



for the administration of salvarsan, and has the decided advantage of 

 permitting the operator to give an intravenous injection to an adult 

 person without assistance. 



1. The cylinder, tubing, and needle should be sterilized by boiling 

 prior to use. 



2. The serum or other fluid may be warmed by placing the container 

 in water of a temperature not higher than 42 C. (just comfortably hot 

 to hold the hand in). 



