104 HOG CHOLEKA 



like series of bleedings takes place, the first oc- 

 curring from seven to ten days subsequent to re- 

 hypering. The final bleeding takes place from the 

 throat in exactly the same manner in which virus 

 pigs are bled, except that the blood is usually 

 drawn into a deep porcelain receptacle, and de- 

 fibrinated by whipping it with a large fork. If 

 inspection does not disqualify, the blood of the 

 hyper, which has been kept separate throughout 

 the two series of bleedings, is admitted to test, 

 and the carcass is placed on the market. 



Handling serum blood. Immediately after the 

 bleeding process is completed the jar containing 

 the blood is sealed, and then shaken for a few 

 moments to whip out the fibrin. When this proc- 

 ess is completed the jar is placed in ice- water. 

 Later, the fibrin is separated from the fluid by 

 exactly the same process that is employed with 

 virus blood. Here again, the clot-press is detri- 

 mental because it adds superfluous debris to the 

 serum and causes it to be exposed to the air un- 

 necessarily. After the defibrinated blood is 

 strained there is added to it, as a preservative, 10 

 mils of 5 per cent aqueous solution of carbolic 

 acid for each 90 mils of blood. The product is 

 then placed in storage bottles, labeled, and re- 

 frigerated pending the time when enough has 

 accumulated for a test. 



In laboratories which do not clarify the serum, 



