184 



BACTERIAL DISEASES OF PLANTS 



FIG. 127. Ricinus communis showing profound dwarfing due to Bacterium 

 solanacearum. The left-hand plant was inoculated at the base of the hypocotyl 

 during germination by three delicate needle pricks. Checks at right. Photo- 

 graphed July 15, 1918. Time 19 days. Experiments of Smith and Godfrey. 



