BACTERIA IN RELATION TO PLANT DISEASES. 



The organism is wax-yellow, deeper or paler according to circumstances, changing to 

 a dirty yellow brown in the plant and in certain old cultures. The color on coconut flesh 

 standing in distilled water is approximately Ridgway's Naples yellow. On turnip cylinders 



Fig. H7.t 



*FlG. 1 16. Longitudinal section of a turnip-root, showing how intercellular spaces are occupied and parenchyma 

 cells wedged apart by Bacterium campestre. A later stage than fig. 114. Drawn from a photomicrograph, x 475. 



|FiG. 117. Bacterial cavity in interior of a turnip-root (plant No. 53), due to Bacterium campestre,^ which was 

 inoculated by needle-pricks on blades of two leaves 52 days prior to fixing material. Exterior sound. Slide 115-!. 

 Drawn from a photomicrograph. 



tFio. 1 1 8. Cross-section of a small turnip-root, showing bacterial pockets and wide distribution of organism 

 in vascular system. Inked from a photomicrograph. In a cross-section of this root lower down the writer counted 

 146 bundles occupied by masses of the bacteria and separated by unoccupied parenchyma. Surface of root unbroken. 



