VIII 



LIST OP ILLUSTRATIONS. 



Page. 



Fig. 115. Solvent action of Bad. campestre on 



middle lamellae 317 



116. Beginning of cavity in a Turnip-root. 318 



117. Closed cavity in a Turnip-root due to 



Bad. campestre 318 



118. Cross-section of Turnip-root showing 



many cavities and vascular occlu- 

 sions due to Bad. campestre 318 



119. Cross-section of Rape-petiole showing 



Bacteria confined principally to 

 the Bundles 319 



120. Longitudinal section showing non- 



lignified cells of Turnip-root filled 

 with Bad. campestre. These border 

 on a reticulated vessel 320 



121. Flagellate Rods of Bad. campestre 



from an Agar Culture 321 



122. Rods of Bact. campestre from Stem of 



Charlock (polar staining ?) 321 



123. Rods of Bact. campestre from Kohlrabi 



from a Gelatin Culture 321 



124. Rods of Bact. campestre from a smear 



from a Cabbage-stem, enlarged 

 from a photomicrograph 321 



125. Rods of Bact. campestre from a Potato 



Culture kept at 12° C 322 



126. Ditto from a 48-hour Bouillon Culture 



at 30° C 322 



127. Ditto from a very old browned Potato 



Culture 322 



128. Portions of three Agar Plates poured 



from stem of Collard (fig. 105 at x). 

 Size of colonies is reduced by 

 crowding 323 



129. Liquefaction of Gelatin by Bact. 



campestre 325 



130. Nongrowth of Bact. campestre over 



Chloroform 327 



130a. Left. Cabbage leaf extruding fluid 

 from water pores. Right. Cabbage 

 leaf showing early stage of marginal 

 (waterpore) infection 332 



Paije. 



Fig. 131. Cross-section of Hyacinth Bulb, show- 

 ing an early stage of Infection 

 (7 Yellow Bundles) due to Inocu- 

 lation of Scape 3i(> 



J32. Cross-section of a Hyacinth Bulb 



Infected from a Flower Stalk 337 



133. Haarlem Bulb Scale, showing Dis- 



organization of Parenchyma 341 



134. Cavity in Parenchyma at extreme 



base of a Bulb-Scale (inoculated 

 plant) 342 



135. A detail from fig. 134 342 



136. Cross-sections of badly Yellowed Bulbs 



(Wakker's disease) obtained by the 

 writer in Holland 343 



137. Cavity in an Inoculated Leaf 344 



138. A detail from 137 345 



139. 140. Rods of Bact. hyacinthi 3^5 



141. Non-segmented threads (filaments) 



oi Bact. hyacinthi 345 



142. Flagellate rods of Bact. hyacinthi 345 



143. Action on Milk of lab ferment pro- 



duced by Bact. hyacinthi 346 



144. Stab-cultures in Gelatin containing 



Malic Acid 347 



145. Behavior of Bact. hyacinthi in fermen- 



tation-tube in presence of Maltose 

 and Peptone 348 



146. Behavior of Lead Acetate Paper ex- 



posed over cultures of Bact. 

 hyacinthi 349 



147. Parts of Agar Poured-plates of Bact. 



hyacinthi, showing slow growth of 

 buried and surface colonies in pure 

 culture 349 



148. Shagreened surface sometimes seen in 



Streak-cultures of Bact. hyacinthi 



on Sugar-agars 35^ 



