128 



Journal of Agricultural Research 



Vol. XIII, No. 3 



Experiment XVI. — Two susceptible pigs, No. 2939 and 2940, were 

 placed in pen 22 on December 16, and the pigeons were allowed free 

 access to this pen, as well as to pen 19, which then contained infected 

 pigs 2457 and 2458 (see Experiment XV). The last-named pigs died 

 on January 7, and were removed from pen 19, which remained unoccu- 

 pied until January 17, when susceptible pigs No. 3480 and 3481 were 

 each injected with 5 c. c. of blood from a sick pig and placed in pen 19. 

 Both of these pigs contracted cholera from the inoculation ; one died on 

 January 31, and the other on February i, and both exhibited extensive 

 lesions of hog cholera at autopsy. 



Pigs 2939 and 2940 were kept in pen 22 from December 16 to Feb- 

 ruary 5. For 37 days of this period infected pigs were kept in pen 19, 

 while during the entire period of 51 days the pigeons had free access 

 to both pens. On February 5, of pigs 2939 and 2940, which had re- 

 mained well, were each injected with 5 c. c. of virus blood to test their 

 susceptibiHty. Both developed hog cholera as a result of the injections. 



Pig 2939 died on February 14, showing extensive hemorrhagic lesions 

 at autopsy, and hog 2940 died on February 27, showing extensive 

 hemorrhagic lesions and intestinal ulceration. 



The results of the three experiments with pigeons as carriers of hog 

 cholera are epitomized in Table XIII. 



Table XIII. 



-Results of tests to determine whether pigeons are disseminators of hog 

 cholera 



