PLATE 12 
A. —New White Hebron tubers from 1919 hills next to leafroll hills in the 
same row. (Half of lot V148, sublot 3, of Table VIII.) Examined for net-necrosis and 
photographed in the last week of May, 1920, in northeastern Maine. The group on 
the right showed net-necrosis, spindling-sprout, and reduction in the number of 
sprouts and produced leafroll plants. Representative tubers from the two groups 
are shown in section in PI. 3, B. From same stock and row as tubers of PI. 12, B. 
B. —New White Hebron tubers from hills leafroll throughout 1919. (Lot 
V148, sublot 2, of Table VIII.) Examined and photographed in the last week of May, 
1920, in northeastern Maine. From same stock and row as tubers of A, and 
like them showed suppression of sprouts, but in contrast showed no net-necrosis or 
spindliness. 
