PI/ATE g 
A. —Results of io of the spindling-tuber grafts, (i) Upper row, groups of tubers 
dug from io diseased hills grown from grafted half tubers originally diseased. {2) 
Middle row, groups of tubers dug from corresponding hills infected by grafting, 
grown from grafted half tubers originally healthy. (3) Lower row, groups of tubers 
from 9 hills grown from ungrafted quartered parts of the same tubers producing 
the middle row; shape healthy. 
B. —Results of leal-mutilation inoculation in insect cage, 1922. (1) Tubers from 
spindling-tuber hill serving as source of inoculum; (2) tubers from inoculated hill, 
with three tubers showing the disease; (3) tubers from uninoculated hill, control 
in same tuber unit as center hill but in different insect cage. Green Mountain 
variety. From stocks caged preceding year. 
C. —Short tuber from spindling-tuber hill, with characteristic eyes and skin of the 
disease (center) and four tubers from healthy hills. Green Mountain variety. 
