LIST OF ILLUSTRATIONS. 



FIGURE PAGE 



Various kinds of bacteria . . . Frontispiece 



1. General shapes of bacteria . * . . . 18 



2. Method of multiplication of bacteria ig 



3. Micrococci . . . . . . . ig 



4. Streptococci . . . . . ig 



5. Sarcina . . 20 



6. Separate rods showing variations in size ... 20 



7. Rod-forms united to form chains .... 20 



8. Various types of spiral bacteria 21 



g. Various shaped rods 23 



10. Bacteria surrounded by capsules .... 23 



11. Various types of bacteria "colonies" . .24 



12. Endogenous spores ....... 26 



13. So-called arthrogenous spores . . . . . 27 



14. Formation of spores in unusual forms (Crenothrix) . 28 



15. Bacteria provided with flagella . . . . 2g 



16. Internal structure of bacteria ..... 30 



17. Threads of Oscillaria . . . . . . 32 



1 8. Bacillus aceticum, of vinegar 53 



ig. Bacillus acidi lactici, of sour milk . . . 71 



20. Dairy bacterium producing red milk .... 73 



21. Dairy bacterium producing pleasant flavours in butter 80 



22. Dairy bacterium producing pleasant aroma in butter 81 



23. Dairy bacterium producing pleasant flavour in butter 83 



24. Dairy bacterium producing " swelled " cheese . . g2 



25. Diagram illustrating Nature's food cycle . . . gg 



7 



