Fic. 73. 



74- 



75- 

 -6. 



77- 

 78. 



79- 

 80. 

 81. 

 82. 

 83. 



84- 

 85- 

 86. 



87. 



88, 



8y. 

 go. 



91. 



93- 

 94. 



95- 

 96. 



97. 



98. 



99. 



100. 



103. 

 104. 

 105. 



TLLUSTl- 



Page. 

 Seedling Sweet-corn Plant in Sta.qe 



when most of Infcetions occur 8g 



■Stomatal Infection of Sweet-corn I,eaf 



by Bacterium Slczvaiii 90 



A Detail from Fi.g. 74, highly magnified. 91 

 \\'ater-pore Infection h) Bacterium caiii- 



pcstre 92 



Bacteria from Fig. 76, enlarged 2,000. ... 93 

 Single Spiral Vessel occupied by Bac- 

 terium cainpcslrc 93 



A\'ater-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 lOi 



Sections through Tooth of a Cabbage- 

 leaf, showing Entrance of Bacterium 



campestre 102 



Green Cucumbers soft-rotted by Bacillus 



caroto-eorus 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 fia" Distribution of Bac- 

 teria 109 



Inoculation Cage for Herbaceous Plants, no 



Labels from Test-tube Cultures Ill 



Wooden Labels from Inoculated Plants ni 



Temperature-record Sheets 112 



Nitrate-bouillon Records 113 



Sample from Card-catalogue, Two-thirds 



Actual size 1 14 



Heading of Large Sheet for Volumi- 

 nous Abstracts 114 



Green-cucumber Skin, Contents rotted 



out by Bacillus aroideae 1 15 



Pillsbury Slide-boxes 116 



Another Form of Pillsbury Slide-bo .\-. . . 117 

 Small Paraffin-oven used by writer 118 



ATIONS. 



XI 



Page. 



EiG. 106. Infiltrated Tissues embedded in Par- 

 affin in a Watch-glass 119 



T07. Infiltrated Material mounted ready to 



cut I TO 



loS. Drawer with Compartments for hold- 

 ing embedded material 120 



rog. Coplin's Stainin,g Jar 121 



110. Coplin's vStaining Jar, cross-section.... 121 



111. A Series of Coplin's Staining Jars 



Ready for Use 12 r 



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



113. A IMounted 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, />, c, d, end 

 views of ,\, B, C. D 123 



115. Leaf-tooth of Cabbage infected by Bac- 



terium campestre 124 



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



118. Stomatal Infection of Cotton-leaf by 



Bacterium m-alvaccuruiii 126 



1 10 The Reinhold-Ciltay Microtome Ar- 

 ranged for cutting Celloidin, etc 1J7 



120. Sub-stage Arrangement on Zeiss 



Stand Ic 130 



I2[. Newer Form of Zeiss-Abbe Camera. ... 131 



122. Zeiss Planar Lenses 132 



123. Apparatus for Photographing Natural 



Size 133 



124. Swinging Camera for Equal Ligbtmg 



of Exposed Object I34 



125 Petri-dish Poured Plate photographed 



by transiuitted light 135 



ij'.'i Green Leaf (Delphinium) w)th 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 li_\- 



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 T48 



135 Top-view of a Small Dark-room shown 



in Fig. 134 149 



