ILLUSTRATIONS. 



Plate I. Fig. 1.— Apple crown-gtiU on grafted tree. Fig. 2.— Apple crown-gall 

 on tranf^planted seedling. Fig. 3.— Hairy-root disease on grafted 



apple tree. Fig. 4. — Hairy-root disease on grafted apple tree 



II. Fig. 1.— Apple seedlings diseased with hairy-root. Fig. 2.— Apple 



seedlings diseased with soft crown-gall 



III. Fig. 1.— Healthy fibrous-rooted apple tree, pot grown. Fig. 2.— 

 Apple seedlings diseased with hairy-root 



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