SYSTEMATIC AND DESCRIPTIVE. 249 



Genus //. Spirillum. 



SPECIES. 



ASSOCIATED WITH DISEASE : 



'Spirillum Obermeieri . Pathogenic. 



I" Pathogenic in man (?), pos- 

 In man . . . Spirillum Cholera Asiaticse-j sibly only saprophytic. 



( Pathogenic in animals. 



Spirillum Finkleri . I Saprophytic in man. 



1 I Pathogenic in animals. 



In animals . / Spirillum tyrogenum . . f< Saprophytic. Pathogenic 



( Spirillum sputigenum j in animals. 



UNASSOCIATED WITH DISEASE : 



Spirillum plicatile 

 Spirillum serpens 

 Spirillum tenue . 

 Spirillum undula 



Spirillum volutans 

 Spirillum Rosenbergii 

 Spirillum attenuatum . 

 Spirillum leucomelaneum 



Simple saprophytes, 



Spirillum Obermeieri (Spiroch&te Obermeieri, 

 Cohn. Spirillum of Relapsing Fever}. Threads 

 similar to the Spirillum plicatile. In length mostly 

 1 6 40 /*, with screw-curves regular (Plate I., Fig. 

 19). They move very rapidly, and exhibit peculiar 

 wave-like undulations. They have been observed 

 in the blood of patients suffering from relapsing 

 fever,* but never in the secretions. They only occur 

 during the relapses, and are absent during the non- 

 febrile intervals. Their number is variable, but 

 usually is strikingly great. Outside the body, in 

 blood serum and 50 per cent, salt solution, the 

 threads preserve their movements. From analogy 

 to the Spirillum plicatile it is presumed that these 

 threads are composed of articulated rods and cocci. 

 Monkeys have been inoculated with success from 



* Obermeier, Med. Central!) . 1873. 



