ILLUSTRATIONS. 



Page. 

 Plate I. Flowering branch of white snakeroot. (Eupatorium ageratoides 



L. f. ) 14 



II . Flowering branch of mountain laurel I Kalm ia latifolia L. ) 22 



III. Fig. 1. — Apple leaves showing leaf -spots produced by natural infec- 



tion. Fig. 2. — Apple leaves showing leaf -spots produced by 

 inoculation with Sphaeropsis malorum Pk 48 



IV. Fig. 1. — TJnsprayed Winesap trees defoliated by the leaf-spot disease. 



Fig. 2. — Sprayed Winesap trees in full foliage, located in the same 

 orchard and photographed at the same time (October 19, 1906) as 

 those shown in figure 1 52 



121 



