194 Manual of Veterinary Microbiology. 



virulence of the bacilli from which they came and 

 capable of transmitting this virulence to new gen- 

 erations of bacilli cultivated at 37°. 



The least virulent varieties obtained produce a be- 

 nignant disease which leaves behind it immunity for 

 the varieties less attenuated, and thus are obtained 

 vaccines of different degrees of intensity, which may 

 be employed in succession. In practice two vaccines 

 only are used, of which one or two drops are in- 

 jected at an interval of ten days. 



In the general part we have described the other 

 methods of attenuation of the charbon bacillus — by 

 compressed oxygen, by heat and by antiseptics — and 

 the vaccination processes which have been derived 

 from them. 



Symptomatic charbon* 



This disease, formerly confounded with charbon 

 properly so called, has been separated from the latter 

 as a result of the investigations of MM. Arloing, 

 Cornevin, and Thomas. It is characterized, first, by 

 the symptoms of a more or less intense fever and by 

 the appearance of a specific tumor upon the body, 

 neck, or upper part of the limbs. This tumor is al- 

 most constantly found in the muscular masses ; it con- 

 sists, at first, of a painful and progressive inflamma- 

 tory engorgement, of firm and uniform consistence ; 

 it rapidly extends in area and in depth and, later, be- 

 comes insensible, crepitant, and resonant at its center 

 (emphysemato-gangrenous tumor). The general symp- 



* [Also occasionally referred to in this work as " bacterial char- 

 bon." Synonyms : Symptomatic anthrax, black-quarter, infectious 

 emphysema; iai. Sarcophysemahsemostaticumbovis; (?€/-. Rausch- 

 brand.— D.] 



