LIST OF ILLUSTRATIONS. 



Frontispiece showing- component parts of a microscope. PAGE. 



Fig. 1. Micrococcus, bacillus, spirillum 17 



2. Bacterium, vibrio, spirochaete 18 



3. Involution forms ' 21 



4. Plasmolytic changes 27 



5. Capsulated bacteria 29 



6. Motile organs or whips on bacteria 36 



7. Giant-whips 39 



8. Cell division 42 



9. Bacilli, single, in pairs and in threads 43 



10. Division forms of micrococci 44 



11. Spirillum forms : 46 



12. Sporulation 49 



13. Position of spores and resultant forms 50 



14. Spore germination 54 



15. Virtual image, simple microscope (Carpenter) 123 



16. Real image (Carpenter) 124 



17. Principle of the compound microscope (Carpenter) 125 



18. Arrangement of lenses in an objective. Angle of aper- 

 ture (Carpenter) 130 



19. Structure and action of the Abbe condenser 133 



20. Cover-glass forceps (F. G. N.) 141 



21. The " hanging-drop " 143 



22. Water-bath with hot iron plate (F. G. N.) . . 150 



23. Enamelled jar for making media '. 153 



24. Burettes for titrating media (F. G. N.) 155 



25. Dry-heat sterilizer 160 



26. Steam sterilizer (F. G. N.) 164 



27. Autoclave 165 



28, Apparatus used in cultivation 172 



29. Inoculation of a single tube. 173 



30. Inoculation from tube to tube when diluting 174 



31. Ice apparatus for cooling plates 176 



32. Water apparatus for cooling plates (F. G. N.) 177 



33. Constant low temperature apparatus (F. G. N.) 179 



34. Potato tubes, ordinary and Roux form 184 



35. Apparatus for filtering agar (F. G. N. ) 237 



36. The incubator or thermostat. . 244 



