190 HOG CHOLEEA 



Most field work falls within the scope of the con- 

 crete instances outlined in this chapter, but it is 

 necessary, as we endeavored to make clear in the 

 beginning, for one who handles hog cholera to 

 understand hog cholera. Our aim throughout has 

 been to show why as well as what, but if we have 

 fallen short of this aim we can at least assure our 

 readers that the methods recommended are con- 

 servative and effective, and that they have been 

 developed as a result of years of field and labora- 

 tory experience. 



One final thought. The beginner in hog cholera 

 work sooner or later finds himself face to face 

 with some baffling situation. A herd seems in 

 need of immediate protection but doubt in regard 

 to diagnosis, doubt as to whether the complete 

 history of the herd has been frankly laid before 

 him, and the question whether complete coopera- 

 tion will be accorded him in the subsequent han- 

 dling of the herd, render selection of the method 

 of immunizing difficult to make. "When in doubt 

 and emergency requires immediate protection of a 

 herd, use serum alone; then follow with simulta- 

 neous treatment in less than four weeks if subse- 

 quent development of the disease requires it" is 

 the final caution we leave with the beginner. 



