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Fig. 6. Spiral bacteria. — 1» 2, and 3. Spirochtcee apis; X 2,000. i,Maassen.J 

 4. Spirillum undula; X 1,300, (Flugge.) 5. Spirillum cholerm Asiaticce; 

 X 3,000. (Hewlett.) 6. Spirillum volutans.; X 1,300. (Cohn.) 7, Thio- 

 spirillum Winogradskii; X 300. (Omeliaiiski.) 



