594 Bulletin i6y 



BRIEF DESCRIPTION OF BACILLUS PARALLELUS 



( NEW SPECIES ) 



I. Morphological Characters 



i. Form. — A short motile bacillus with rounded end- oc- 

 curring singly, typically in twos; long chains common upon 

 solid media. 



2. Size. — Individual cells had the following dimensions. 

 ( )n hanging: blocks: length 1 to 2.6 microns, diameter .8 to 1.0 

 microns. Hanging drops; length [.6 to 4.0 microns, diameter 

 .5 to .<j micron, stained preparations; length .8 to 2. microns, 

 diameter .5 to .8 microns. 



3. Grouping. — Short and long chains; delicate membran- 

 ous pellicle. 



4. Bndospores. — None observed. 



5. The flagella were peritrichiate : tufts were common at 

 each end of short chains, but lateral flagella were also present 

 on what appeared to be individual cells. Easily demonstrated 

 by Ldwit's or Loeffler's method. 



6. Capsules. — Capsules easily demonstrated upon prepara- 

 tions from 10 day broth cultures by Welch's method or Richard 

 Muir's contrast stain. Frequently 2 and as many as 5 cells oc- 

 curred side by side within the same capsule with flagella arising 

 about the periphery of the envelope. 



7. Zoogloea. — Small zoogloea masses were common in 

 liquid cultures. 



8. Staining reactions. — Gram's stain: Deeply stained even 

 after 15 minutes in absolute alcohol; with arnyl alcohol. Gram's 

 stain was irregularly retained after 5 minutes' exposure. Aqueous 

 fuchsin: deeply stained. Aqueous gentian violet: well stained. 

 Carbol fuchsin ( Ziehl ) : well stained. 



II. Cultural Features 

 1. Agar stroke. — Not characteristic; a narrow filiform. 

 white slim) to viscous band. Doubtful fluorescence of the 

 medium. 



