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DISEASES OF POULTRY. 227 



mon was investigated by Moore in 1894 and 1895 and 

 described under the name infectious lezikcemia. The 

 term leukaemia (or leucsemia) is used to designate a 

 condition of the blood in which there is a deficiency 

 of coloring matter. In the disease under considera- 

 tion the blood is light colored or pale owing to a con- 

 siderable decrease in the number of red globules and 

 ^ ^ an increase in the 



* * « • • * « number of white 



V •» • , corpuscles or 



*% * « * * leucocytes. As 



the malady was 



found to be caused 



by a bacterium 



* ^ % and to be infec- 



* tious, it was de- 



* % V cided to call it in - 



Fig-, as.— Bacterium sanguinarmm, bouillon cnl- J^cttOUS UuklSmta. 

 ture, (magrnifled 2,000 diameters). A Sufficient num- 



ber of cases have not yet been studied to permit a 

 satisfactory description to be written ; but such facts 

 as have been noted are summarized in this article. 

 The disease has frequently been mistaken for fowl 

 cholera, and has been observed in Rhode Island, 

 Maryland, District of Columbia, and Virginia. A 

 very fatal outbreak of this disease has been observed 

 by the author in a large brooder -house among in- 

 cubator chickens from one to three weeks old. 



Symptoms. — The disease appears with a consider- 

 able elevation of temperature, reaching three degrees 

 or more above the normal. There is drowsiness and 

 general debility, with paleness of the mucous mem- 

 branes and also of the comb, wattles, and skin about 

 the head. The fever is of a continuous type. 



