PLATE 12 
A. —(i) Second-generation progeny to Green Mountain plant treated as A, 2. (2) 
Split tuber from Green Mountain plant inoculated by leaf mutilation with juice from 
unmottled curly-dwarf Green Mountain. The two somewhat spindle-shaped tubers 
are progeny from the split tuber. 
B. —Leaves from Green Mountain plant infected with streak; stem from unmottled 
curly-dwarf Green Mountain plant, August 19, 1921. 
C. —(1) Leaf from plant inoculated with juice from curly-dwarf Rural New Yorker. 
(2) Healthy leaf. (3) Leaf showing streaking. All leaves from Rural New Yorker 
variety. 
