il. 100, U. S. Dept. of Agricultur 
Plate I. 
Fig. 1.— Three Matured Nuts of European Walnut Seedling. 
[Middle nut natural size, other two undersized from attack by aphides.] 
Fig. 2.— Upper Side of Three Leaflets of European Walnut Seedling. 
[The central leaflet shows growth of fungus thriving upon the exudation of aphides above. 
Two-thirds natural size.] 
