MANUFACTURE OF HOG-CHOLERA SERUM 355 



5 or 6 pounds. Blood should not be drawn if the animal has 

 shown a loss in weight or shows evidence of an abnormally high 

 temperature. 



After having been secured and properly fastened the hog is 

 taken into the bleeding room, and preparations are now made to 

 withdraw the blood. The point selected for this purpose is the 

 tail. This organ is drawn out through the rear end of the crate 

 and very thoroughly scrubbed with soap, water, and creolin or other 



Fig. 65. — Bleeding room of modern serum plant (State Serum Plant, Nashville, 

 Tenn.). 



coal-tar disinfectant. Following this it is carefully shaved and 

 bathed with alcohol. It is now ready for operation. The operator 

 now comes on the scene with a sharp chisel which is to act as the 

 guillotine, and a small block of wood which serves as the block. 

 The tail is laid upon this piece of wood, and with one blow of the 

 chisel about 1 inch is clipped from its end. The chisel and block 

 used in this operation are perfectly clean and washed with alcohol 

 just before use. 



