PLATE EX. 
Copied from photographs by Koch in Cohn’s ‘* Beitrdge zur Biologie der 
Pflanzen,’ Bd. II., Heft 3. 
Fie 1. — Zooglea ramigera from fluid containing rotting alge. 
xX 200 by Seibert’s immersion objective No. 7.! 
Fie. 2. — Spirillum undula. > 500. 
Fie. 3. — Bacillus (subtilis ?), from hay infusion, showing flagella. 
x 500. , 
Fie. 4. — Spirochete from human mouth, resembling the Spiroch- 
ete Obermeieri of relapsing fever. X 500. 
Fie. 5. — Bacilli, with spores from rotten onion. » 500. 
Fie. 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 
