FIG. 73 



74- 



75- 

 76. 



77- 

 7. 



79- 

 80. 

 Si. 

 82. 



84. 

 85. 

 86. 



87. 



88. 



89. 

 oo. 



92. 

 93- 

 94- 



95- 

 96. 

 97- 

 98. 

 99- 

 100. 



101. 



Seedling Sweet-corn Plant in Stage 

 when most of Infections occur 89 



Stomatal Infection of Sweet-corn Leaf 

 by Bacterium Steward 90 



A Detail from Fig. 74, 'highly magnified. 91 



Water-pore Infection by Bacterium eam- 

 pestre p 2 



Bacteria from Fig. 76, enlarged 2,000 93 



Single Spiral Vessel occupied by Bac- 

 terium eampestre 93 



Water-pore Infection in Cabbage; a 

 later stage than that shown in Fig. 76. 94 



Angular Leaf-spot of Cotton, Nearly 

 Natural Size 95 



End of Vacuum-pipe on Laboratory- 

 table 96 



Portion of Work-table, showing Simple 

 Apparatus for Distilling Water 97 



Apparatus for rapidly filling Test-tubes 

 with Measured Portions of Fluid Cul- 

 ture-media 98 



Can for holding Culture-media 99 



Wrapped Petri Dishes 100 



Meyer's Hypodermic Syringe 101 



Sections through Tooth of a Cabbage- 

 leaf, showing Entrance of Bacterium 

 campestre 102 



Green Cucumbers soft-rotted by Bacillus 

 carotoi'orus 103 



Block for holding Test-tube Cultures. .. 104 



Constant Burner, with Cut-off for re- 

 ducing Size of Flame 105 



Steel Sewing Needle (No. 10) set into 

 Bone-handle and used for Puncture- 

 inoculations 106 



Compressed-air Tank and Spray-tube. . . 107 

 Atomizers for use with 92 108 



Hand-sprayer for Distribution of Bac- 



ILLUSTRATIOXS. 

 Page. 



teria . 



109 



103. 



104. 

 105. 



Inoculation Cage for Herbaceous Plants, no 



Labels from Test-tube Cultures m 



Wooden Labels from Inoculated Plants, in 



Temperature-record Sheets 112 



Nitrate-bouillon Records 113 



Sample from Card-catalogue, Two-thirds 



Actual size j j 4 



Heading of Large Sheet for Volumi- 

 nous Abstracts i r 4 



Green-cucumber Skin, Contents rotted 



out by Bacillus aroideae 115 



Pillsbury Slide-boxes 116 



Another Form of Pillsbury Slide-box. . . 117 

 Small Paraffin-oven used by writer 118 



XI 



Page. 



FIG. 1 06. Infiltrated Tissues embedded in Par- 

 affin in a Watch-glass 1 19 



107. Infiltrated Material mounted ready to 



cut Ilg 



108. Drawer with Compartments for hold- 



ing embedded material 120 



109. Coplin's Staining Jar 121 



no. Coplin's Staining Jar, cross-section.... 121 

 in. A Series of Coplin's Staining Jars 



Ready for Use 121 



112. A Page from the Paraffin-record-book. . 122 



113. A Mounted Slide of Serial Sections. .. . 122 



114. A, Rodgers knife for serial sections; B, 



Lentz knife for cutting hard material 

 with slant stroke; C, Torrey knife for 

 serial sections; D, Torrey knife for 

 free-hand sections, a, b, c, d, end 

 views of A, B, C, D 123 



115. Leaf-tooth of Cabbage infected by Bac- 



terium eampestre 124 



116. 117. Details from Fig. 115 124, 125 



nS. Stomatal Infection of Cotton-leaf by 



Bacterium malvacearum 126 



1 10. The Reinhold-Giltay Microtome Ar- 



ranged for cutting Celloidin, etc 127 



120. Sub-stage Arrangement on Zeiss 



Stand Ic 130 



121. Newer Form of Zeiss-Abbe Camera. ... 131 



122. Zeiss Planar Lenses 132 



123. Apparatus for Photographing Natural 



Size 133 



124. Swinging Camera for Equal Lighting 



of Exposed Object 134 



125. Petri-dish Poured Plate photographed 



by transmitted light 135 



126. Green Leaf (Delphinium) with Black 



Spots; photographed on a rapid non- 

 isochromatic plate 138 



127. Green Leaf (Delphinium) with Black 



Spots ; photographed on a slow iso- 

 chromatic plate 139 



128. The Wager Exposure-scale 141 



129. The Collins-Brown Camera, made by 



Folmer & Schwing 145 



130. Cross-level for use with Camera 146 



131. Device for cutting out light in Air-shaft. 146 



132. Side-view of a Dark-room, convenient 



for a few persons 147 



133. Top-view of a Dark-room, convenient 



for a few persons 148 



134. Side-view of another Small Dark- 



room I4 s 



135. Top-view of a Small Dark-room shown 



in Fig. 134 I4Q 



