FOWL CHOLERA 8i 



of the rods form dumb-bells or even short chains. 

 The size of the single rods in stained preparations is 

 o.2/i thickness, the spherical ones 0.2 fi in diameter, 

 the oval and rod-shaped 0.4-0.5 /j- in length, some are 

 longer, o. 8 /* ; there are some which measure i - 1 . 5 /J', 

 but on careful examination it will be found that these 

 are really dumb-bells of rods. ^ 



The bacilli are present in large numbers in the 

 blood of all organs, and almost in pure cultivation in 

 the mucoid contents of the intestine. 



Inoculation into fowls, pigeons, and rabbits, of 

 a drop of blood or of a drop of a broth culture of 

 the microbe, produces invariably the disease and 

 death in from 20-36 hours under the same symptoms, 

 and the same distribution of the bacilli. In the 

 rabbit, death as a rule occurs within 24 hours, some- 

 times in as short a time as 18-20 hours, the blood 

 teeming with the bacilli ; haemorrhages in the liver, 

 the intestine, and peritoneum being generally found. 

 In the rabbit dead of the inoculated disease, the 

 bacilli are oval or rod-like and of the same character 

 as those in the fowl and pigeon, but there are a great 

 many that are almost spherical, far more than in the 



1 The size of the bacilli generally given in text -books (Fliigge, 

 Baumgarten) is too large. The above figures given by me were 

 ascertained with exact measures. In the illustrations given both by 

 Fliigge and by Baumgarten, the microbe is also represented of too 

 large a size, as is proved by photographs. 



G 



