36 



THE OEGANISM IS A BACILLUS. 



THE GELATINE IS LIQUEFIED. 



THE OBGANISM IS NON-MOTILE AND NON- 

 CHEOMOGENIG. 



THE COLONIES ABE BEANCHING. 



Bacillus of anthrax, rod-shaped bacilli, having a length of 3 to 5 /i 

 sometimes in filaments ; sporulation well marked ; the spores 

 are highly refractive oval bodies, appearing in the centre of the 

 rods, and are set free by the absorption of the protoplasm ; stains 

 by Gram ; liquefies blood serum ; on agar the colonies form a 

 fine network of interlacing filaments. 



Eacillus veimicularis (Frankland), from river- water; baeilU 2 to 

 3 n long, with rounded ends, forming oval spores in the centre 

 of the rods. 



Leptothrix buccalis (Vignal), from the mouth ; bacilli 1 to 30 /i in 

 length, 1 /I in breadth, characterized by transverse partitions 

 in the interior of the rods, visible after staining ; very slow 

 growth; in gelatine stick cultures a bluish myooderma forms 

 on the surface of the hquefied gelatine. 



Bacillus F of Vignal, from healthy salivary secretion ; bacilli 1 to 

 2 /x in length, with rounded ends ; grows on gelatine as small, 

 white, opaque colonies, divided into segments ; the gelatine 

 is very slowly hquefied, a, white mycoderma forming on the 

 surface, and a white deposit at the bottom of the tube ; blood 

 serum is slowly hquefied. 



Bacillus B of Vignal, from healthy buccal secretion ; baciUi with 

 square ends, 1 to 6 /t long ; sometimes in chains ; forms small 

 gray colonies, with undulating margins ; a white membrane 

 forms on the surface of the hquefied gelatine. 



Bacillus varicosus conjunctivae (Gombert), from the healthy con- 

 junctival sac; large baeOh, 2 to 8 /t long, with round ends; 

 sometimes constricted in the centre. 



Bacillus pulps pyogenes (Miller), from gangrenous tooth-pulp ; 

 shghtly- curved bacilh vrith pointed ends. 



