FIG. 13 



Eel-worm is a serious disease in many plants, but carnations are especially 

 liable to it. Both the carnations shown above (typical specimens of a 

 group experiment) were potted in soil known to be infected, with the 

 object of testing- whether humogen gave resistant powers to the 

 plant. The humogen-treated carnation, although infested in the 

 early stages, gradually grew away from the pest and developed into 

 a perfect plant. The untreated, although receiving various stimu- 

 lating plant-foods, reached the stage shown and then collapsed. 

 (The Royal Gardens, Kew.) 



