ILLUSTRATIONS 



FIO. PAQB 



1. Shapes of bacteria 15 



2 Involution forms 16 



,.. Forms and groupings of the cocci 18 



4. Capsules of various bacteria 19 



5. Flagella of bacteria 21 



6. Spores of bacteria 22 



7. Acetobacter 31 



8. Nitrosomonas 31 



9. Nitrobacter 31 



10. Azotobacter 32 



11. Rhizobium 32 



12. Bacillus 33 



13. Clostridium 34 



14. Neisseria 35 



15. Streptococcus : 35 



16. Diplococcus ' 36 



17. Staphylococcus 36 



18. Micrococcus 36 



19. Sarcina 37 



20. Pseudomonas 37 



21. Erythrobacillus 37 



22. Erwinia 38 



23. Proteus 38 



24. Bacterium 39 



25. Pasteurella 39 



26. Hemophilus 40 



27. Lactobaeillus 40 



28. Vibrio 40 



29. Spirillum 40 



30. Yeast cells 44 



31. Multiplication of yeasts by budding 45 



32. Development of spores in yeast 45 



33. Types of hyphae in molds 51 



34. Development of a zygospore in a Vucor 53 



35. Formation of ascospores and asci in Aspergillus 54 



36. Development of spores and sporangia of Mucor 55 



37. Mold spores (conidia) 56 



38. Types of spore production by molds 56 



39. Rhizopus 59 



40. Common species of Mucor 60 



xvii 



