196 Manual of Veterinary 3licrobiotogy. 



measuring in the adult, non-sporulated condition 5/i 

 to 8// by 1// ; after fruiting they may attain larger di- 

 mensions — 10// by I'Sju; as long as their contents are 

 homogeneous they are cylindrical, but their form 

 changes with the appearance of the spores; generally 

 the spore is terminal and gives the bacillus a bell- 

 clapper or club-shaped appearance; sometimes it is 

 central, the bacillus then becoming spindle-shaped. 

 The spore is solitary, ovoid, and very distinct; it oc- 

 cupies one-third of the length of the element. 



The bacillus Chauvoei is endowed with oscillatory 

 motion. It is strictly anaerobic; hence we should 

 not expect to find it in the blood, at least during life ; 

 after death, when the oxygen is no more renewed by 

 the pulmonary exchanges, it penetrates into this fluid. 



Action of 2}hysical and chemical agents. 



^' ' The virus withstands extreme cold and 



^*^^ • after being dried also resists for a con- 



^^ siderable time the action of high tem- 



Bacilliofsvmp-P^^^^^''^^' i* ^^ ^^'^ destroyed by ex- 

 tomatic charbon, posure for two hours to 80°, or for 

 nou-sporulated twenty minutes to 100°; on the other 

 and sporulated. }^rjj-,(] j^^ perishes in two minutes in 

 (M. and L.) , .,. 



boiling water. 



The serosity dried at about 35° retains its virulence 

 for more than two years. 



Putrefaction has no effect on the bacillus of symp- 

 tomatic charbon. 



The bacllh, when they have escaped from the ca- 

 davers and been deposited upon the soil, preserve 

 their virulence for a long time if the external condi- 

 tions permit of their rapid desiccation ; under other 

 conditions they are more or less quickly attenuated and 



