XIII ATTENUATION OF VIRUS OF FOWL ENTERITIS 119 



days the fowl seemed perfectly well again ; it and the 

 pigeon were then inoculated with broth culture of the 

 bacillus of fowl cholera. At the same time one con- 

 trol fowl and one control pigeon were inoculated with 

 the same culture. Both the pigeons were dead in 

 1 8 hours of typical fowl cholera ; both fowls were 

 very ill during the second, third, and fourth days, very 

 drowsy, had copious diarrhoea, but both gradually 

 recovered. 



From these experiments it follows, (i) that while 

 both the pigeon and fowl are susceptible to fowl 

 cholera, the pigeon in a higher degree than the fowl, 

 this is totally different as regards fowl enteritis, since 

 the pigeon is refractory and the fowl very susceptible ; 

 (2) that a first attack from fowl enteritis does not 

 protect the fowl from an attack of fowl cholera. 



Although the two diseases are different, the mode 

 of their spread and the general behaviour of the two 

 species of bacilli are similar, and therefore the rules 

 that should guide us in the prevention of the spread 

 of either should be the same. These may be sum- 

 marised in saying — (i) every fowl that shows any 

 suspicion of the disease should be at once removed, 

 killed, and burned; (2) the remaining fowls should be 

 at once transferred to new ground, and, if practicable. 



