78 HOG CHOLEKA 



sanitation. All laboratories which make inter- 

 state shipments must secure licenses from the fed- 

 eral government and submit to regulations which 

 have been formulated to protect those who use 

 the products. The laboratories must meet certain 

 well-defined requirements before they are allowed 

 to operate, and thus despite great deviation in de- 

 tail, the same fundamental processes are used in 

 all of them. We will consider first the essential 

 requirements for preparing the protective defib- 

 rinated blood, which has been called anti-hog-chol- 

 era serum, and which forms the basis of all the 

 more or less refined products used to prevent hog 

 cholera in the field. 



Buildings. The buildings should be suited to 

 the conditions under which the laboratory is to 

 operate. These conditions vary so widely that 

 uniformity is neither to be expected nor desired, 

 but certain governing principles should be ob- 

 served in all construction. In general, simplicity, 

 convenience in operation, and provisions for clean- 

 liness are the primary considerations. Future up- 

 keep costs should also be reduced to a minimum 

 in the original construction. Under most condi- 

 tions concrete is the best material to use. 



The walls, ceiling and floors should be fin- 

 ished so that water will not injure them. The 

 floors should be drained in a sanitary manner. 

 Steam or hot water heat should be provided, the 



