DISEASES AND PARASITES OF FOWLS 391 



immunity or power of resistance to the disease, and until 

 further light is thrown upon the subject, it is just as well 

 to accept the theory that it is a disease, which if not the 

 result of low vitality, need not be greatly feared where the 

 health and vigor of the stock is unquestioned. 



The Agglutination Test. While there is no known cure 

 for bacillary white diarrhoea, recent investigations by Jones 

 of Cornell University have indicated an accurate test for 



TAKING A BLOOD SAMPLE FOR WHITE DIARRHCEA TEST 

 (Photo by C. S. Brewster.) 



infected fowls. It is called the agglutination test. By this 

 test it is possible to determine whether or not adult fowls 

 are infected. The importance of the test lies in the fact 

 that it is possible for the poultryman to eliminate this dis- 

 ease in chicks by breeding only from fowls that the test 

 shows are free from it. Several of the experiment stations 

 have facilities for making these tests for poultry breeders. 



