PHOTOGENIC OR PHOSPHORESCENT BACTERIA 143 



Finally, we may mention that plants which in their growth bend 

 towards the light, if this strikes them laterally, e.g. plants placed 

 to grow near the window, will likewise bend towards a phosphorescent 

 light. If some peas be placed in a pot, and the latter be placed 

 near a gelatine plate-culture of phosphorescent bacteria, the young 

 stems, as they emerge from the soil, will bend towards the phos- 

 phorescent light. 



