BACTERIUM SEPTIC^MI^ HEMORRHAGIC&. 211 



of rabbit septicemia (Davaine's septicemia). It is differ- 

 entiated from Nos. 1-3 by a more abundant growth on 

 potato, and in milk sufficient acid is formed to produce 

 coagulation. 



For chicken cholera the following are susceptible : 

 Chickens, turkeys, ducks, geese, pigeons, in general all 

 domestic fowls, sparrows, finches, rabbits, and white mice. 

 Usually guinea-pigs are slightly susceptible. Compare, on 

 the contrary, Tjaden (C. B. xxv, 224). Every method of 

 inoculation (also with only very small quantities) as well 

 as feeding are successful, death occurring in birds usually 

 after from twelve to forty-eight hours, rarely after from 

 seven to twelve days. Superficial inoculation by cuts into 

 the pectoral muscles with a lancet is most generally em- 

 ployed. 



Postmortem Findings. In pigeons, at the place of inocu- 

 lation in the muscle, there is a whitish-yellow, thick, 

 nodular swelling and discoloration of the muscle ; in 

 hens often more of a cloudy, edematous infiltration an 

 appearance of diagnostic value. Dead animals have large 

 ecchymoses in the serous membranes (especially in the 

 pericardium), besides serous or fibrinous pericarditis, 

 hemorrhagic enteritis, and serous lobular pneumonia 

 (Kitt). (Dogs and cats devour dead birds without 

 injury.) During life the birds present suddenly develop- 

 ing choleraic symptoms, together with loss of appetite, 

 weakness, giddiness, ruffled plumage, thirst. Rabbits and 

 mice die quickly, without local manifestations, or an 

 abscess forms at the point of inoculation, which for weeks 

 contains the characteristic bacteria. 



Special Methods of Demonstration. Inoculation 

 of a pigeon by very shallow cutaneous incisions in the 

 breast, 2-3 cm. long. Characteristic organisms abun- 

 dantly present in the blood of the inoculated animal 

 (bipolar staining); change at the point of inoculation 

 (necrosis). 



The bacillus gallinarura E. Klein is a variety (C. B. v, 689; vi, 

 257; and xvm, 105). 



Closely related are : The disease of ring-doves of Leclainche/A. P., 

 1894, .490) and the duck cholera of Cornil and Toupet (C. B. iv, 

 333); hens are immune to both these latter. Similar also are the 



