Vaccinating for Blackleg 



365 



or a piece of string saturated with the material; either 

 of which is to be inserted beneath the skin with special 

 instruments made for the purpose. The powdered vac- 

 cine, which is the kind generally used, requires to be 

 mixed with water, filtered, and injected beneath the skin 

 by means of a hypodermic syringe. Fig. 55. The 

 powdered vaccine is put up in little ten- and 

 twenty-five-dose packages, the number of 

 doses being indicated on the wrapper. 



In preparing the vaccine and using it, 

 care must be taken that the instruments 

 and the other accessories are absolutely 

 clean and sterilized. In using the double 

 vaccine, the powder is first placed in a 

 little porcelain mortar and some clean boiled 

 water measured out, a few drops of which 

 are added to the vaccine, which is thoroughly 

 ground into a very fine paste in the mortar. 

 After this is done, the remainder of the 

 boiled and cooled water is added, one cubic 

 centimeter for each dose of vaccine. The 

 mixture is then filtered through filter -paper 

 or cotton placed in a sterile glass funnel, 

 and is then ready for use. The syringe is 

 filled with the vaccine, and one cubic centimeter is in- 

 jected beneath the skin of each animal over eight 

 months old; under eight months, the dose should be 

 graduated according to the size of the animal. 



The safest place to inject the vaccine is on the under 

 side of the tail about four inches from the tip, although 

 some vaccines may be injected beneath the skin of the 



Fig. 55. Hypo- 

 dermic syringe 

 for vaccinating. 



