3 I 2 BACTERIOLOGY. 



outwards from the central streak on the surface, 

 forming a feather-like cultivation* (Fig. 121). They 

 are present in garden earth, and have also been 

 cultivated from the air when charged with dust 

 raised from the soil. 



Bacillus tremulus. Rods shorter and thinner 

 than those of Bacillus subtilis. They are provided 

 with a flagellum at both ends, and exhibit charac- 

 teristic trembling and rotatory movements. Spores 

 thicker than the bacillus, and often placed laterally. 

 They were observed on rotting plant infusions, 

 forming a thick slimy skin. 



Bacillus of jequirity, Sattler. Rods 2 4-5 ju, 

 long and -58 p, thick. They can be cultivated on 

 nutrient gelatine and blood serum. Infusion of je- 

 quirity containing the bacilli, or an artificial cultiva- 

 tion of the bacilli, inoculated into the conjunctiva 

 of healthy rabbits produces severe ophthalmia. The 

 poisonous principle is, however, believed to be a 

 chemical ferment, a6rm,and not the bacillus. Boiling, 

 which does not destroy the spores of the bacillus, 

 destroys the ferment, and cultivations started with 

 these spores, though teeming with jequirity bacilli, 

 are quite harmless.! The bacilli occur in infusions 

 of the beans of Abrus precatorius, or jequirity. 



Bacillus caucasicus, Kern. Rods forming 

 two spores, one at each end, otherwise similar to 



* Described by the author, " Notes from a Bacteriol. Laboratory," 

 Lancet. 1885. 



t Klein, Micro-organisms and Disease. 1885. 



