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64 



Mycologia V. 2, No. 3, p. 109-124, pi. 24-26. 



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26. 



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PLATE 1 

 Fig. 1. Wheat in soil treated with pyridine. Three bottles on 

 left are sterile; three bottles on right are inoculated. 

 Fig. 2. Wheat in soil untreated. Three tumblers on left con- 

 tain soil from inoculated bottles; three tumblers on right con- 

 tain soil from sterile bottles. 



Fig. 3. Wheat in soil treated with pyridine. Three tumblers 

 on left contain soil from inoculated bottles; three tumblers on 

 right contain soil from sterile bottles. Compare with Fig. 1. 



PLATE 2 



Fig. 4. Wheat in soil treated with vanillin. Three tumblers 



on left contain soil from inoculaicd bottles; three tumblers on 



right contain soil from sterile bottles. 



Fig. 5. Wheat in soil treated with cumarin. Three tumblers 



on left contain soil from inoculated bottles; three tumblers 



on right contain soil from sterile bottles. 



Fig. 6. Wheat in soil treated with quinoline. Three tumblers 



on left contain soil from inoculated bottles; three tumblers 



on right contain soil from sterile bottles. 



