188 



Diseases of Poultry 



and the intervening spaces infiltrated with round cells. The 

 changes in the hepatic tissue are presumably secondary to 

 the engorgement of the organ with blood." 



Dawson's diagnosis of the disease (An. Rep. Bur. An. 

 Ind., 1898, p. 350) differs somewhat from the one given by 

 Moore. 



It is very difficult to distinguish this disease from fowl 

 cholera except by identifying the bacteria which produce 

 the diseases. Moore contrasts the characteristic lesions in 

 the appended columns : 



Foivl cholera 



Infectious leukcemia 



1. Duration of the disease 



from a few hours to 

 several days. 



2. Elevation of temperature. 



3. Diarrhea. 



4. Intestines deeply reddened. 



5. Intestinal contents liquid, 



muco-purulent, or blood 

 stained. 



6. Heart dotted with eeehy- 



moses. 



7. Lungs affected, hyperaemic 



or pneumonic. 



8. Specific organisms appear 



in large numbers in the 

 blood and organs. 



9. Blood pale (cause not deter- 



mined). 



10. Condition of leucocytes not 

 determined. 



1. Duration of the disease 



from a few hours to 

 several days. 



2. Elevation of temperature. 



3. Diarrhea very rare. 



4. Intestines pale. 



5. Intestinal contents normal 



in consistency. 



6. Heart usually pale and 



dotted with grayish 

 points, due to ceU in- 

 filtration. 



7. Lungs normal, excepting in 



modified cases. 



8. Specific organisms compara- 



tively few in the blood 

 and organs. 



9. Blood pale, marked 



diminution in the num- 

 ber of red corpuscles. 

 10. Increase in the number of 

 leucocytes. 



Attention should be called to the fact that as yet there 

 seems not to have been a careful study of the condition of 

 the blood in fowl cholera. Salmon observed many changes 



