LIST OF ILLUSTRATIONS. 



PLATES. 



Faces 

 page 



PLATE r. Cucumber Leaves attacked by B. 

 tracheiphilus (colored); also Tubes 

 of Litmus Milk i 



2. Water-pore Infections on Cabbage 



Leaf (plant No. 402) at end of two 

 months 58 



3. Infections through Stomata in Black 



Spot of Plum 58 



4. Early Stage of Infection in Black 



Spot of Plum, showing Bacteria 

 Escaping through Central Rift 60 



5. Coconut Palms in middle and late 



stages of the Budrot 70 



5<. Cross-section of a daisy stem between 



tumors, showing the tumor strand. 72 

 56. Cross-section of a secondary tumor 



in a daisy petiole, showing stem 



structure 72 



6. Olive Shoots showing Tubercle Me- 



tastasis 72 



7. Paris Daisy with leaf showing Sec- 



ondary Tumor 72 



8. Result from Inoculating Bact. tume- 



faciens into Shoots of Oleander, 

 Daisy, and Olive 90 



9. Result from Inoculating Bact. savas- 



lanoi into Shoots of Oleander, 



Daisy, and Olive 92 



10. Atrophy and Death of Shoot due to 



Bact. tumefaciens 92 



Faces 

 page 



PLATE 1 1 . Four Varieties of Potatoes Inoculated 

 with Bacillus phylophthorus, show- 

 ing variable Resistance and differ- 

 ence in Color of Decayed Tissue . . 96 



12. Serradella grown with and without 



Root-nodules on Nitrogen-free Soil . 1 02 



13. Stages in Bacterial wilt of Cucumbers, 



Anacostia, D. C., 1893 210 



14. Six Cucumber Plants destroyed within 



three weeks by B. tracheiphilus as a 

 result of Infected Needle-pricks .... 212 



15. No. i, Effect of Inoculating Squash 



Bacillus into Cucumber; No. 2, 

 Transmission of Disease by 

 Diabrotica 214 



16. Two stages of Bacterial Wilt of 



Cucumber due to Inoculations by 

 Needle-pricks; No. i, Inoculated 

 from Cucumber; No. 2, from Squash 222 



17. Brown Stain in Vascular Bundle of 



Cabbage attacked by Bact.campestre. 

 Also tube of Bact. stewarli and of 

 Bact. phaseoli (on potato) (colored) . 300 



1 8. The Ragged Leaf of Cabbage 304 



19. Wakker's Yellow Disease of Hyacinths 



Inoculated Leaves and Scape, 

 and Infected Bulbs (colored) 336 



20. Yellow Disease of Hyacinths Inocu- 



lated Scape, badly Diseased Bulbs, 

 and Cultures in Litmus Milk 336 



TEXT FIGURES. 



Page. 



KIG. i. Stem of Potato No. 13 (1895) at- 

 tacked by Bact. solanacearum 5 



2. Peas growing under Sterile conditions 



on Gelatin Media 23 



3. Ciri of Bact. mori oozing from Len- 



ticels on young shoots of Mulberry . 28 



4. The Gum-bud Disease of Carna- 



tions 34 



5. Gelatin Impression of Helianthus Leaf. 35 



6. Cross-section of Vascular Bundles of 



Cucumber attacked by Wilt show- 

 ing location of Bacterial Infection . . 52 



7. Bacterially Infected (wilted) Leaf of 



Cucumber gnawed by striped Cu- 

 cumber Beetles 53 



8. Effect of Light Frost on Leaves of 



Magnolia 54 



FIG. 



Page. 



9. Water-pore Infections of Cabbage 



Leaves 28 days after Spraying 55 



10. Cabbage Plant No. 400, attacked on 



margins of Older Leaves, i. e., 

 through Water-pores, as a result 

 of Pure-culture Inoculations by 

 Spraying 56 



1 1 . Section parallel to surface of Leaf 



through Water-pore region of Cab- 

 bage attacked by Bacterium cam- 

 pestre 57 



12. Earliest stage of Infection in Black 



Spot of Plum 58 



13. Natural versus Artificial Infection in 



Black Spot of Plum 60 



14. Inner Husk of Sweet-corn attacked by 



Bacterium stewarti 61 



