LIST OF ILLUSTRATIONS. VII 



Fig. Page. 



58. Details from base of sweet corn kernels showing bacterial occupation 131 



59. (a) Bad. stewarti from Margin of a Hanging Drop after 52 Hours in Bouillon at 3oC. (b) Bait. 



slewarli from Yellow Slime on Potato after 3 Days at 30 C 131 



60. Flagella of Bad. stewarti 1 33 



61. (a) Gelatin-stab-culture of Bad. stewarti (non-liquefying), (b) Gelatin-stab-cultures of Liquefying 



Non-pathogenic Yellow Organism from Surface of Corn Kernels 133 



62. Agar-streak-cultures of Bad. stewarti 134 



63. Top of an Old Agar-stab-culture of Baet. stewarti enlarged to show Crystals in Surface Growth 134 



64. Bad. stewarti on Potato (at left), with Bad. campestre for Comparison 135 



64a. Cirri of Bad. Stewarti oozing from stomata (pedicel of ear) 147 



65. Bacterium amaranthi occupying Intercellular Spaces in the Pith of an Amaranth 148 



66. Interior of a Pith-cell Occupied by Bad. amaranthi 149 



67. Xylem Vessels of Amaranth Occupied by Bad. amaranthi 149 



670. Photomicrograph of Bad. amaranthi in the tissues 150 



68. Cross-section of Root of Javan Peanut, showing Bacteria Confined to the Bundles 151 



69. Cross-section of Stem of Peanut from Java, showing Bacteria Restricted to the Xylem Part 151 



70. A Detail from fig, 69 152 



71. Cross-section of Petiole of Peanut, showing Bacteria in Vessels and Formation of Cavities 152 



71a. Danish Orchard grass attacked by Rathay's disease 158 



716. Austrian Orchard grass showing Rathay's disease: stem pushing out sidewise from leaf-sheaths . . 158 



71c. Rathay's disease: cross-sections of culms, showing bacterial layer between leaf and stem, etc. . . 158 



jid. Cross-section of upper part of Dactylis showing dense bacterial growth between the leaves 159 



71c Small portion of margin of leaf, showing multiplication of bacteria in intercellular spaces 159 



71/. Detail of Dactylis leaf more highly magnified, from a section similar to that shown in fig. 71c . 159 



7ig. Capsules of Aplanobader rathayi 159 



71/;. Rods of A planobacicr rathayi adhering to the surface of a leaf of Dactylis 159 



72. Cross-section of a Tomato Stem from Epidermis to Pith, showing effect of the Grand Rapids Dis- 



ease Cavities in Phloem 163 



73. A Detail from Margin of Bacterial Cavity in the Outer Phloem shown in fig. 72 163 



74. Longitudinal Section through Phloem of Tomato Stem (fig. 72, inner cavity) showing Bacterial 



Masses wedging apart the Sieve-tubes 1 64 



75. Grand Rapids Tomato Disease, showing Avidity of the Bacteria for Meristematic Tissues 164 



75a. Streaks of ( 1 ) Apt. rathayi and (2) Apl. michiganense on steamed potato 165 



76. Cross-section of Banana Fruit-stalk, showing Bacillus musae oozing from the Cut Bundles 169 



77. Rorer's Bacterial Disease of Banana Leaf Inoculated in Washington 169 



78. Behavior of Bacillus musae in Gelatin-stab-cultures (compare with fig. 1 1 1) 1 70 



79. Longitudinal Section of Leaf-stalk of Banana, showing some Parenchyma Cells Occupied by the 



Bacteria and Others Free 171 



80. (a) Longitudinal Section through Bundle in Leaf-stalk of Banana, showing Parasitism of Fusarium 



cubense. (b) Longitudinal Section through Banana Bundle Attacked by Bacillus musae 172 



81. Bad. solanacearum occupying Vessels in the Root of an Egg-plant from Porto Rico 175 



82. Section through External Part of Infected Tuber of Inoculated Potato Plant No. 14 (1896), showing 



Bacterial Infection Restricted to the Vascular System (V) 1 76 



83. Cross-section of Small Potato-tuber Infected naturally by Bad. solanacearum, showing Partial Dis- 



appearance of Starch and Restriction of Bacteria to Vicinity of the Vascular System 1 76 



84. Cross-section of Underground Tuber-bearing Stem of Potato Infected in the Vascular Ring by Bad. 



solanacearum, the Movement of the Bacterial Growth being toward the Tuber 177 



85. A Detail from fig. S4, showing the Character of the Bacteria occupying the Vessels 177 



86. Cross-section of .Stem of Inoculated Potato Plant No. 14 (1895), showing Vascular Bundle Occupied 



by Bad. solanacearum, and Cavities in the outer Phloem 1 80 



S7. Transmission of Bacterial Brown Rot to Potato by Insects 181 



88. Cross-section of Bundle of Datura stramonium from Plant 23 (1895), showing Bacterial Cavity. . 182 



89. Cross-section of Stem of Solatium nigrum from Inoculated Plant No. 34 (1896) showing Bacterial 



Occlusion of the Bundles 183 



90. A Detail from One of the Bundles in fig. 89, showing the Bacteria more Clearly 184 



91. Radial Longitudinal Section of Stem of Nightshade (fig. 89), showing Destruction of Bundle 184 



92. A Detail from fig. 91, showing bacterial Occlusion of a Pitted Vessel 185 



93. Cross-section of Stem of Physalis from Plant No. 57 (1896), showing Bacteria in Bundles. . 185 



94. A Radial Longitudinal Section from the same Physalis Stem as fig. 93 186 



95. Cross-section of Petiole of Potato from Inoculated Plant No. 23 (1901) 1S7 



96. Tomato Plant No. 10 (1903), 7 Days after Inoculation with Bad. solanacearum 188 



