INOCULATING INSTRUMENTS. 



173 



to be injected at each operation. Such syringes are now made with 

 asbestos or metal plungers, and can be taken to pieces, or are of 

 such a nature as not to be injured by boiling or otherwise sterilising. 

 Before making the injection the point of operation should be 

 shaved and thoroughly disinfected. Care must be taken, except in 



Fin. 22. r >. — Sterilisable syringe ; ready for use. 



I-I»_ 



Fig. 226. — Sterilisable syringe ; dismounted, 

 endermic inoculation, that the fluid really penetrates beneath the 

 skin and not into it or into the muscular tissue, as often 

 happens. Neglect of these precautions, or failure thoroughly to 

 sterilise the instruments, explains most of the cases of abscess 

 formation, and other exceptional complications after inoculation. 

 The best plan is to raise a fold 

 of skin with the left thumb and 

 fore-finger and rapidly thrust 

 the needle through the skin in 

 the length of the fold. The fluid 

 is spread over a larger surface 

 by gently manipulating the 

 parts after removing the needle. 



After injection the syringe and needle must be thoroughly washed 

 and sterilised. 



As a rule no special restraint is needed, as the pain is very 

 trifling. In large vaccine institutes the smaller animals are usually 

 secured on movable operating tables. 



Fig. 227. — Roux's sterilisable syringe 

 without piston. 



