78 



CLINICAL BACTERIOLOGY AND 



becomes brown. A temperature of about 140° C. has now 

 been reached, and at this stage the oil should be aspirated 

 and expelled several times, when the syringe will be found 

 sterile. 



Seat of Inoculation. 



In the horse and ox the region chosen for inserting one's 

 vaccine or serum is usually one easy to get at, and where 



Fig. 32. — Vaccine Syeinge. 



the subcutaneous tissue is plentiful. Over the scapula or 

 midway up the cervical region fulfils both qualifications. 

 In the dog the most convenient situation is on the inside 

 of the thigh, for here the skin is thin and nearly devoid of 

 hair. Where many injections require to be carried out, 



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Fig. 33. — Serum Syringe. 



it is advisable to operate on one side and then on the 

 other, and upon no account should one injection follow 

 another in exactly the same spot. 



The hair should be clipped at the seat of inoculation, and 

 the skin painted with strong tincture of iodine or a little 

 pure lysol lightly applied. This precaution we never fail to 



