3i8 



BACTERIA IN REFLATION TO PIvANT 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.n8.t 



Fig. 117.t 



*FiG. 1 1 6. — Longitudinal section of a turnip-root, showing how intercellular spaces are occupied and parenchyma 

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



fFiG. 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-I. 

 Drawn from a photomicrograph . 



|FiG. 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. 



