Memoir 127 



Plate VI 



SURFACE COLONIES OF VARIOUS BACTERIAL PATHOGENES OF THE BEAN 



A, Phytomonas vignae var. leguminophila; B, Phyt. viridiflava; C, Phyt. phaseoli var. fuscans; 

 I), Phyt. flacrumfar.iens; E, Phyt. medicaginis var. phaseolicola 



A to D, Colonies seven days old, temperature 27" C, beef-extract agar CpH 7.0), X 2. E, Same con- 

 ditions except that colonies are fourteen days old and agar is slightly acid 



