THE LOWER BACTERIA 



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FIG. 1. 1. Coccus. 2. Streptococcus. 3. Staphylococcus. 4. Capsulatecl diplococcus. 

 5. " Biscuit "-shaped coccus. 6. Tetrads. 7. Sarcina form. 8. Types of bacilli 

 (1-8 are diagrammatic). 9. Non-septate spirillum xlOOO. 10. Ordinary spirillum 

 (a) comma-shaped element; (b) formation of spiral by comma-shaped elements 

 XlOOO. 11. Types of spore formation. 12. Flagellated bacteria. 13. Changes in 

 bacteria produced by plasmolysis (after Fischer). 14. Bacilli with terminal proto- 

 plasm (Biitschli). 15. (a) Bacillus composed of five protoplasmic meshes ; (&) proto- 

 plasmic network in micrococcus (Biitschli). 16. Bacteria containing metachromatic 

 granules (Ernst, Neisser) some contain polar granules. 17. Beggiatoa alba. Both 

 filaments contain sulphur granules one is septate. 18. Thiothrix tenuis (Wino- 

 gradski). 19. 'Leptothrix innominata (Miller). 20. Cladothrix clichotoma (Zopt). 

 21. Streptothrixactinomyces (Bostrom), (a) colony under low power ; (6) filament 

 showing true branching ; (c) filament containing coccus-like bodies ; (d) filament 

 with club at end. 



