CH. XI] BACILLI ; SPECIFICALLY PATHOGENIC 205 



specific disease ; (2) in the rodent in which they produce the 

 acute hemorrhagic septicaemia ; (3) in the rapidity of growth, 

 aspect, and size of their colonies on gelatine in the plate and 

 streak culture ; and (4) in the presence or absence of motility. 



To this group belong : — (i) Bacillus of Davaine Septi- 

 caemia. (2) Bacillus of Fowl Cholera. (3) Bacillus of 

 Frettchenseuche. (4) Bacillus of Duck Cholera. (5) 

 Bacillus of Fowl Enteritis. (6) Bacillus of Grouse Dis- 

 ease. (7) Bacillus of Swine Fever, or Hog Cholera (and 

 Swine Plague). (8) Bacillus of Wildseuche. And (9) 

 Bacillus of Oriental Plague of Man. 



The following short account is copied from Klein's article, 

 Infectious Diseases, in Stevenson and Murphy, II., pp. 97, 

 98, 103, 104, 105, 106, 107, and 108 : — 



I. Bacillus of Davaine septicamia. — This is a septicemia 

 which. Davaine first produced by injecting into rabbits 

 putrid ox's blood. It is known now that a small motile 

 bacillus is the microbe, which by its great multiplication 

 and universal distribution in the circulating blood causes 

 the disease and death. The microbe is present in the 

 blood in great numbers, nearly as great as that of the blood- 

 corpuscles ; in stained specimens the rods, which are short 

 and oval, show a stained granule at each end with a clear 

 space in the middle ; the length of the rods is about I'S/*, 

 in thickness about half The rods are motile, and from the 

 heart's blood and all other tissues pure cultures can easily be 

 made. In plate cultures after about two days minute white 

 dots are visible ; under a glass they appear as flat circular 

 discs, white in reflected, yellow brown in transmitted light. 

 After several days the colonies are larger, and appear thicker 

 and broader in the centre than in the periphery, which 

 itself appears more or less concentric owing to regular 

 differences in thickness. At maximum growth the 



