VIBRIO AND SPIRILLUM 



407 



spiral. Its length varies bet\Yecn 2 and 5 /x ; it often forms 

 continuous felted masses ; it is motile. 



Occasionally the sjjirilla grow to a great length — two, 

 three, and more of them formine a chain ; the individual 



Fig. 164. — Vibrio Serpens in S\\ar.ms (.\fter Coiin). 



spirilla are not arranged in a linear series, but folded into a 

 zigzag. This form, which in reality is not a special kind of 

 spirillum, is called by Cohn 1 spirochmia pllcatiHs. The 



Fig. 165. — Spirillu.m Tenue, (i) singly and (2) i.v S\\'.\RMS (after Cohn). 



spirillum found in the tartar of the teeth is of this form, 

 spirochata deiiticola. But there exist all intermediate forms 

 between a single sijirilluni tenue and a spirochasta. In 

 stained specimens the construction of the spirochoeta from 



^ B<:ili iii^c '^Hf Bioh'gid d. P/Ianzc}!, vol. ii 



