PLATE IX. 



Copied from photographs by Koch in Cohn's " Beitrdge zur Biohgie der 

 Pjlanzen," Bd. II., Heft 3. 



Fig 1. — Zooglosa ramigera from fluid containing rotting algae. 

 X 200 by Seibert's immersion objective No. 7. 1 



Fig. 2. — Spirillum undula. X 500. 



Fig. 3. — Bacillus (subtilisf), from hay infusion, showing flagella. 

 X500. 



Fig. 4. — Spirochete from human mouth, resembling the Spiroch- 

 ete Obermeieri of relapsing fever. X 500. 



Fig. 5. — Bacilli, with spores from rotten onion. X 500. 



Fig. 6. — Bacilli, with spores from surface of rotten potato. 

 X 500. 



1 A higher power (500) shows that these branches are made up of oval bacteria 



