ILLUSTRATIONS 



PLATES 



PLATE I 

 1. BACILLUS PRODIOIOSUS, 2. BACILLUS SUBTILIS . To face 



PLATE II 



1. BACILLUS RAMOSUS. 2. BACILLUS VIOLACEUS ) 



3. BACILLUS ARHORESCENS j ' j 



ILLUSTRATIONS IN TEXT 



1. KOCH'S STEAM STERILISER 2 



2. HIGH-PRESSURE STEAM STERILISER (Mueucke) . . 3 



3. HOT-AIR STERILISER 4 



4. Koux's METHOD OF CULTIVATING ORGANISMS ON SLICES OF 



POTATO .......... 22 



5. H.KMATIMETER (after Jorgensen) 21) 



6. LEVELLING APPARATUS FOR MAKING PLATE-CULTIVATIONS . . 32 



7. PETRI GUI/IT RK-IUSH 34 



8. KSMARCH TUBE-CULTURE , , . , . . 35 

 y. C. FRANKEL'S ANAKROBIC TUBE-CULTURE, .... 40 



10. ANAKROBIC CULTURE 41 



11. SUSPENDED I)ROP-CULTUI:ES 59 



12. APPARATUS FOR COLLECTING SAMPLES OF WATER AT DEFINITK 



DEPTHS (Miquel) . . . . , . . . 62 



13. \YOLFFH UGEL'S COUNTING APPARATUS 78 



14. PHOTOGRAPHIC KKPRODUCTION OF v ( I ELATINE-PLATE CULTURE 81 



15. PASTKUR CHAMBKRLAND FILTER 173 



1C. MULTIPLICATION OF HACTF.JMA IN SPRING WATERS ( Miqiiel). 225 



17. MULTIPLICATION* OF HACTKRIA IN IMPURE WATERS |Mi()iiel) . ^27 



18. TYPHOID HACILLJ FROAJ A TURK CUI.TI J;K .... 289 



19. TYPHOID BACILLI 289 



20. CHOLERA BACILLI, FROM A PURE CULTURE ...;. 29(5 



21. UACILLI OF ANTHUAN , ...... 810 



22. TYPHOID 1> \CILLI IN AGAI.'-AGAK. EXPOSED TO DIRECT Si:x- 



MMNK FOR ONE JIOUR 3(51 



23. FORMS OF KWTEIMA 395 



24. CRENOTIIRIX KI'IINIANA 512 



25. FORMS OF YK.GKTATIOX OF CLADOTJIRIX DICHOTOMA . . . 514 



26. FUSISI-ORIUM MOSCHATUM 520 



27. ,. 520 



28. 520 



