PLATE s 
A. —Tuber with spindling sprouts coming from the part which later was found, by 
cutting, to be affected with net-necrosis. 
B. —Two leafroll Green Mountain hills in the same hill lot, the one on the left pro¬ 
duced by a half of a net-necrosis tuber and the one on the right produced by a half 
of a sister tuber that transmitted leafroll but showed no net-necrosis. 
