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Plate Legends. 



Plate I. Infection of the grape leaf by Plasmopara viticola. 



Plate II. Haustoria and mycelium of Plasmopara viticola. 



Plate III. Fructifications of Plasmopara viticola. 



Plate IV. A few stages in the development of the oospore. 



Plate V. Sections of healthy and diseased shoots. 



Plate I. 



Infection of the grape leaf by Plasmopara viticola. 



Figs. 1, 2, 4 and 5 are on the leaves of the variety Delaware; the others 



are on the variety Clinton, x 750. 



Fig. 1. Seven hours after inoculation at 50 F. 



Fig. 2. Twenty hours after inoculation at 50 F. 



Ficr. 3. Seven hours after inoculation at 50 F. 



Fig. 4. Thirty-six hours after inoculation at 70 F. 



Fig. 5. Thirty-six hours after inoculation at 70 F. 



Fig. 6. Thirty-six hours after inoculation at 50 F. 



Fig. 7. Twenty hours after inoculation at 50 F. 



Fig. 8. Twenty hours after inoculation at 50 F. 



Fig. 9. Thirty-four hours after inoculation at 50 F. 

 Fig. 10. Thirty hours after inoculation at 50 F. 

 Fig. 11. Thirty-six hours after inoculation at 50 F. 



