DISEASES OF POULTRY. 227 



niou was investigated by Moore in 1894 and 1895 and 

 described under the name infect ious Icuhnnia. The 

 term leukaemia (or lenccemia) 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 



corpuscles or 



V> « * leucocytes. As 



.• ; • . . - * 



the malady was 

 found to be caused 

 b}' a bacterium 

 * » % and to ]je infec- 



* tious, it was de- 



j ^ \ cided to call it in - 



Fiff. (A.—Bactfriitm saiiguiiiariunu bouiUon cul- J(^('il(^J<S leitkceima. 

 ture, (mag-nified 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 l^een 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 com!), wattles, and skin about 

 the head. The fever is of a continuous tj'pe. 



