gS INFECTIOUS LEUKAEMIA 



5. Koch. Die Aetiologie der Milzbrand-Krankheit begriindet auf 

 die Entwickelungsgeschichte des Bacillus Anthracis. Cohti's Bciti'. zur 

 Biol, der Pflanzen. Bd. II ( 1876) p. 277. 



6. M'Fadyean. Anthrax. The four, of Coinp. Path, and Therap. 

 Vol. XI. (1S9S) p. 51. 



7. Moore. Report of an outbreak of Anthrax. Annual Report, 

 Commissioner of Agriculture of the State of New York. 1897. 



S. P.^STEUR, Chamberi,.and ET Roux. De 1 'attenuation des virus 

 et de leur retour a la virulence. Comp. Rend.de V Acad, des Sc. T. XCII 

 (18S1). p. 427. 



9. P.^steur. Le vaccin des charbon. Ibid. p. 666. 

 10. PollEnder. Mikroscopische und niichrochemische Untersu- 

 chung der Milzbrandblutes. 1855. 



INFECTIOUS LEUKAEMIA IN FOWLS. 



§ 82. Characterization. A specific leukaemia of fowls 

 caused by a bacterium. It is not known whether or not other 

 species of domesticated birds are susceptible. 



§ 83. History. This disease was first briefly' described, 

 but not named, hy Moore in 1895. At that time it had been 

 studied in but a few fowls and these the last to die in their 

 respective flocks. In the following year other fowls were ex- 

 amined very carefully from two outbreaks of the disease and it 

 is upon the data obtained in these investigations together with 

 those procured from many produced cases that the description 

 of the disease is based. In 1898, Dawson found it to be the 

 cause of very serious losses among poultr}' near Baltimore, Md. 

 In all of the outbreaks studied, the owners of the fowls first 

 reported the disease as chicken cholera. 



S 84. Geographical distribution. It was first studied 

 in fowls taken from an outbreak in Virginia. Since then, it 

 has been identified in Maryland, the District of Columbia, and 

 Block Island, R. I. There is good evidence in the numerous 

 reports of destructive fowl disease to believe that it is quite 

 widespread in the United States. Thus far, there seem to be 

 no reports of its existence in other countries. 



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