LIST OF ILLUSTRATIONS. 



PLATES. 



PLAT*. FACM PAOI. 



1. Cross-sections of Diseased Cane-stems, showing Ooze of Bacterium rascularum and Red Stain 16 



2. 3. Cane Plants Destroyed by Bact. rascularum as a Result of Needle-prick Inoculations on Leaves 2 to 



3 feet from the Nodes 14, 26 



4. Longitudinal Section, showing Top-rot of Cane Due to the Introduction of Bact. rascularum by Needle- 

 pricks 4 months earlier on Leaf-blades lower down 28 



j. Bacterial Ooze from Vessels of Cane-plant No. 40, Inoculated with Bad. vascular urn (second time through 



plant) 30 



6. Two Plants of Sweet Maize Dried Up and Destroyed by Bad. strwarli (natural infection) 90 



7. First Cases of Stewart's Disease Obtained from Pure-culture Inoculations early signs 98 



8. Sweet-corn Plants Drying Up from Stewart's Disease, 66 days after Inoculation late signs 98 



9. !. 'Mkiiiinlin.il Radial Sections through Stems of Inoculated Sweet-corn, showing Nodal Stain, Pockets in 



Parenchyma, and Yellow Bundles (dark lines in the photograph) too 



10. Base of Inoculated Plants XLII and XI.VI or XLVII Affected by Stewart's Disease, showing Nodal 



Stain, Absence of Stain in Cortex, Externally Sound Roots, etc 102 



si. Cross-sections of Inoculated Cane-Stems, showing Red Stain and Yellow Ooze. Also Cultures of Bad. 



vascular um, Bad. stewarli, and Aplanobader michiganense (colored) 138 



i io Cross lection of two spikelcts of Dadylis glomerata attacked by Rathay's disease 156 



I lA Poured plate agar cultures of Aplanobader rdlhayi 160 



12 to 15. Grand Rapids Tomato Disease. Hot-house Plants Inoculated from Pure Cultures 162 



16. Inoculated Chinese Banana Plants Destroyed by Bacillus musae 170 



1 7. One clump from Plate 16; Inoculated Parent Plant Killed, Sucker Diseased 170 



18. Inoculated Moko Plantain Destroyed by Bacillus musae 1 70 



19. Red Banana Inoculated with Bacillus musae, showing Characteristic Break of Leaves at Top of Plant 170 



20. (i) Cross-sections of Diseased Fruit-stalks of Banana. (2) Longitudinal Section of a Sucker, show- 



ing Rhizome and Base of Pseudo-Stem with Infected (Black) Bundles 170 



21. (i) Section of Root-stock of Red Banana, showing Blackened Vascular Bundles. (2) Same Rhizome as 



fig. i, but here there are Bacterial Cavities as well as Blackened Bundles 170 



22. (i) Pseudo-Stem of Chinese Banana in Cross-section, showing Bacterial Destruction of Inner Leaves. 



(2) Same as fig. i, but a Cross-section at the Base of the Pseudo-Stem, showing many Infected 



Bundles (black specks) 1 70 



23. Potatoes Attacked by Bad. solanacearum; also Cultures of this Organism, of Bacillus solanisaprus, of 



Bacillus phytophthorus, and of Aplanobader rathayi (colored) 174 



24. Solatium tuberosum. Solatium commersoni, and Lycopersicum esculenlum, attacked by Bad. solanacearum. 176 



25. Potato-plants from a Field in Virginia, showing Effect of Bact. solanacearum 1 76 



26. 27. Two Plates illustrating the Progressive Effect of Bact. solanacearum (South Carolina strain) upon the 



Tomato (left-hand shoot infected by needle-pricks) 1 78 



28. Tomato-plant which did not Wilt on being Inoculated with Bad. solanacearum, although other Signs 



developed 1 78 



29. Another Tomato-plant Somewhat Resistant to Bact. solanacearum 178 



30. District of Columbia Potato from which was Isolated a very virulent Strain of Bad. solanacearum 180 



31. Potato Shoots Inoculated with a Pure-culture of Bact. solanacearum from Plant shown in Plate 30 188 



32. Effect of Liquid Air on Bad. solanacearum. Checks at left 198 



33. Inoculated Tobacco-plant No. 8 (1905), showing the Granville Tobacco Wilt 228 



34. Leaf from an Inoculated Tobacco-plant, showing irregular Action of the Wilt 228 



35. Diseased Leaf from Inoculated Tobacco-plant No. 34 (1905) 228 



36. Group of 9 Inoculated Tobacco-plants Destroyed by the North Carolina Tobacco Wilt 228 



37. Petri-dish Agar Poured-plates of the North Carolina Tobacco-wilt Organism 228 



38. Collapsed Tobacco-plant from the Second Set of Inoculations No. 3 1 (1903) 230 



39. Surface and Sectional Views of Stems of Inoculated Tobacco-plants 35 and 36 (1905) 230 



40. Results Similar to Plate 39 Obtained by Inoculating Tobacco with Bad. solanacearum from a Potato. 230 



41. Tobacco Wilt; also enlarged spikelets of orchard grass showing Rathay's disease (colored) 232 



42. Brown Stripes on Tobacco-stems Attacked by North Carolina Tobacco Wilt (1908) 234 



43. The Jimpson Weed, Datura stramonium Attacked by the Granville Tobacco Wilt (1908) 236 



44. Tobacco wilt (action of Medan organism on cream) and for comparison Aplanobader mtchifanense, 



Bacterium campestre, and Bacterium mori 264 



45. Loss of virulence in Bacterium solanacearum a8a 



(Total Plates 47.) 



V 



