318 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 
o % 
Fig.118.t 
Fig. 117.¢ 
*Fic. 116.—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 froma photomicrograph. x 475. 
{Fic. 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 r15—I. 
Drawn from a photomicrograph. 
{Fic. 118.—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, 
