LIST OF ILLUSTRATIONS. 



Frontispiece stowing' 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 3ft 



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 " 14a 



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



23i— Enamelled jar for making media 153- 



24.— Burettes for titrating media (P. 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 (P. 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 



