INFECTIOUS DISEASES AND MICROBES, ETC. 255 



Bacillus anthracis measures from 5 to 20 /i long, 

 and from 1 to 1*25 //, broad (Fig. 50), and often 

 occurs in masses of filamentous threads. It pro- 

 duces oval spores, and when either the bacillus or 

 its spores are injected into mice, guinea-pigs, sheep, 

 rabbits, etc., they die with all the characteristic 



B 





FIG. 50. BACILLUS ANTHRACIS. 



A, Bacilli (a) forming spores ( x 1200). 



B, Convolutions of bacillary threads (x 320). 



lesions, etc., of anthrax. Even the inhalation of the 

 spores is capable of giving rise to anthrax in man 

 and susceptible animals. B. anthracis has been 

 found in the blood, spleen, and other organs, also in 

 the urine and faeces of animals suffering from or 



