PLATE 27 



A. — Leaves from graft shown in B, of this plate: At right, from healthy parent of 

 scion; at left, from mosaic stock; in center, from mosaic scion. 



B. — At left, healthy scion grafted to diseased stock, Green Mountain variety; at 

 right, two mosaic shoots of stock. Grafted July 6, 1918. Scion decidedly mottled 

 August 17, 1918. In field, Presque Isle, Me., 1918. 



C. — Leaves from corresponding parts of the plants shown in Plate 29, B. These 

 leaves were near the tops of the plants and matured long after all aphids had been 

 removed. The characteristic mottling was obscured by the use of reflected light, 

 but the contrast in the evenness of the leaf surfaces is evident. Greenhouse, 

 Orono, Me., 1919. 



