29G 



SWINE PRACTICE 



after which it is ready for use. The laboratory for mixing and bot- 

 tling must be properly constructed in order that contamination of 

 the serum may be reduced to a minimum and the necessary equip- 

 ment, such as sterilizers, must be provided. 



Fig. 81. HYi'ERi.MMUNizi.\G Rdo.M. 1. virus-contaiiier showing attachmeut to 

 pressure tank; 2, needle inserted into the ear vein. 



For mixing the serum a container must be selected that can be 

 sterilized and from which the serum can be bottled. 



After thoroughly mixing the serum constituting a series it is with- 



