LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Acetic Acid Bacteria (Bacterium aceti). (After Hansen) . . 2 



2. Brewers' Yeast (SaccJiaromyces cerevisice). (After Hansen) . 2 



3. Penicillium glaucum ........ 2 



4. Growing Top Yeast. (After Mitscherlich) .... 3 



5. Clostridia. (After Prazmowski.) Spore Formation in the 



Common Butyric Acid Bacteria ..... 4 



6. Plectridia. (After Migula.) Spore Formation in the Tetanus 



Bacterium ......... 4 



7. Spore Formation in Wine Yeast. (After Hansen} ... 4 

 SA. Mucor Mucedo. (After Kerner) ...... 5 



8s. Transverse Section of a Single Sporangium. (After Brefeld) . 5 



9. Penicillium glaucum. (After Brefeld) ..... 6 



10. Oidium lactis. (After de Bary) ...... 6 



11. Mucor racemosus with Chlamydospores. (After Brefeld) . . 6 



12. Zoogloea of " Leuconostoc," a Coccus which forms slimy lumps 



in Cane Sugar Solutions. (After Zopt) .... 7 



13. The Bacterium of "Long Milk." Capsule Stage. Milk not yet 



slimy .......... 7 



14. The Bacterium of " Long Milk." Slimy Stage ... 8 



15. The Bacterium of " Long Milk." Milk less slimy, but beginning 



to go thick owing to acid formation .... 8 



16. Stab Cultures. A. The Anthrax Bacterium (aerobic). B. The 



Swine Erysipelas Bacterium (facultative anaerobic). (After 

 Migula.) C. The Tetanus Bacillus (obligate anaerobe). 



(After Ball) 10 



17. Involution Forms of Bacterium aceti produced by cultivation at 



39 to 41 C. (After Hansen) . . ' . . .16 



18. Freudenreich Flask 17 



19. PetruschJcy Flask 17 



20. Incubator with Petri Dishes, Plugged Test Tubes, Apparatus 



for Measurement of Gas Production, etc. . . .18 



21. Desiccator for Anaerobic Cultivation . . . . .19 



22. Stribolt's Method for the Cultivation of Anaerobic Bacteria. 



(After Salomonsen) ....... 22 



23. J or gens en' s Moist Chamber ....... 23 



24. A. Cornet's Forceps. B. Kuhne's Forceps .... 24 



25. Bacterium pyocyaneum, monotrich. (After Migula) . . 26 



26. Bacterium syncyaneum, lofotrich. (After Migula) ... 26 



27. Bacterium typhosum, peritrich. (After Migula) ... 27 



28. Bacterium vulgare, peritrich. (After Migula) .... 27 



29. Various Cocci. (After Flugge) 27 



30. Vibrio cTiolerce. (After Migula) 28 



31. Various Screw-shaped Bacteria. (After Flugge) ... 28 



32. Actinomyces bovis. (After Bostr'om) 29 



