ILLUSTRATIONS. 



PLATES. 



Pago. 

 PLATE I. Frontispiece. 



(1) Ferdinand Colin, founder of mod- 



ern systematic bacteriology. De- 

 ceased. 



(2) Robert Kocb, founder of German 



school of bacteriology, director 

 of the Institute for Infectious 

 Diseases at Berlin. 



(3) Louis Pasteur, founder of French 



school of bacteriology. De- 

 ceased. 



(4) Dr. Roux, one of the leading spir- 



its of the Pasteur Institute. 



(5) Em. Duclaux, professor in the 



University of Paris and director 

 of the Pasteur Institute. De- 

 ceased. 



2. Bacterial Olive-knots produced on 



four plants by needle-pricks 10 



3. Cross-section of Petiole of Musk- 



melon, showing bundles disorgan- 

 ized by Bacillus tracheiphilus 12 



4. Datura metclloidcs eight days after 



Inoculation with Bacterium solaua- 

 ccariim 16 



5. Zeiss Horizontal Photomicrographic 



Outfit 26 



6. Arnold Steam Sterilizer, Lauten- 



schlager Dry Oven, Hot Plate, and 

 Chamberland's Autoclave 48 



7. Hydrogen Generator and Wash Bot- 



tles in use 56 



8. Thermostat-room 74 



g. Chamberland Autoclave 84 



10. Engine for furnishing Vacuum and 



Compressed Air 94 



Page. 



PLATE 1 1. Culture-room, i. <-., place for making- 

 Cultures of Bacteria in Still Air.. . . 104 



12. Movable Hood of Wood and Glass, 



under which Bacteriological Trans- 

 fers may be made 106 



13. The Reinhold-Giltay Microtome 120 



14. Distilled-wator Apparatus 124 



15. Zeiss Stand Ha 129 



16. Zeiss Photomicrographic Stand Ic.... 129 



17. Mounted Camera for Enlarging, Re- 



ducing, and Natural-size Work 134 



iS. Lantern-slide Room 144 



19. Black Spot of the Plum 148 



20. Bacterial Disease of Broomcorn 150 



21. Bacterial Black Spot of Walnut 174 



22. Ditto, Late Stage 176 



23. Transmission of Wilt of Cucumber 



by Insects 178 



24. Brown Rot of Potato. Natural Infec- 



tion of Tuber, Artificial Infection of 

 Stems 202 



25. Brown Rot of Potato. Shoots wholly 



destroyed by inoculation 202 



26. Tomato-plant inoculated with Bac- 



terium solaiiaccanun 202 



27. Bacterial Wilt-disease of Tobacco. .. . 202 



28. Young Pear-shoots blighted by Bacil- 



lus amylovorus 202 



29. Green Pear-fruits eight days after In- 



oculation with Bacillus amylovorus. 202 



30. Quince-shoots and Pear-fruits (cross- 



section) showing Blight due to 

 Bacillus amylovorus 202 



31. Small Green Apples blighted by Ba- 



cillus amylovorus. . . 202 



TEXT FIGURES. 



Pagt. 



Fin. I. Cross-section of Sweet-corn Stem para- 

 sitized by Bacterium Stni'arti 4 



2. Cross-section of a Raw Carrot, showing 



wedging apart of Parenchyma Cells 



by Bacillus carotovorus 5 



3. A Detail from Fig. 2 6 



4. Turnip-root, showing Bacterium camf'cs- 



tre confined to vicinity of Vessels.... 7 



5. Bacterium camfcsirc. A small portion 



of Fig. 4 enlarged 10 



Page. 



Fie. 6. Turnip-root, showing Bundle occupied 

 by Bacterium campestre and the com- 

 mencement of a cavity; a later stage 

 than Fig. 5 n 



7. Cauliflower-petiole, showing Bundle de- 



stroyed by Bacterium campcstre 12 



8. Melon-wilt due to Bacillus tracheiphilus. 13 



9. Cross-section of Bundle of a Cucumber- 



stem, showing Bacillus tracheiphilus 

 restricted to the Spiral Vessels and 

 Three pitted vessels 15 



