ILLUSTEATIONS 



PnATES 



Platl: I P-^'^^^ 



1. Bacillus prodigiosus. 2. liAciLLUS subtilis . To face 



Plate II 



1. Bacillus ramosus. 2. Bacillus violackus i 

 3. Bacillus arboeescens ) 



i20 



ILLUSTRATIONS IN TEXT 



FIGL'RII 



1. Koch's Steam Steriliser 2 



2. High-pressure Steam Steriliser (Maencke) . . . '6 

 y. Hot-air Steriliser 4 



4. Eoux's Method of cultivating Organisms on Slices of 



Potato . ........ 22 



5. H^matimeter (after Jorgensen) 2^ 



6. Levelling Apparatus Fop making Plate-Cultivations . . 32 



7. Petri Culture-dish 84 



8. EsMARCH Tube-culture 35 



9. C. Frankel's Anaerobic Tube-cultuue .... 40 



10. Anaerobic Culture 41 



11. Suspended Drop-cultures . . . . . . 5y 



12. Apparatus for collecting Samples of Water at definite 



depths (Miquel) ....... 02 



13. Wolffhugel's Counting Apparatus 78 



14. Photographic Reproduction of a Gelatine-plate Culture 81 



15. Pasteur- Chambeeland Filter 17;j 



16. Multiplication of Bacteria in Spring "Waters (Miquel). 225 



17. Multiplication of Bacteria in Impure AVatkrs (Miquel) . 227 



18. Typhoid Bacilli from a Pure Culture .... 289 



19. Typhoid Bacilli 289 



20. Cholera Bacilli, from a Pure Culture .... 290 



21. Bacilli of Anthrax HIO 



22. Typhoid Bacilli in Agar-agar, exposed to Direct Sun- 



shine for One Hour ... ... 301 



23. Forms of Bacteria ;^95 



24. Crenothrix Kuhniana 512 



25. Forms of Vegetation of ('ladothrix dichotoma . . . 514 

 20. FusisPORiuM moschatum 520 



27. „ ,. 52U 



28. „ M 520 



