PLATE 14 
A. —Stem-in-vial inoculation with mosaic. 
B. —Four Irish Cobbler hills, July 6, 1922, each with spindling tuber. The two on 
the left have had it at least a year longer than the two on the right, as the former were 
planted with seed tubers showing the disease while the latter were planted with seed 
tubers appearing healthy. The two outside plants have leaf roll in addition. 
C. —Volunteer potato plants in buckwheat. July 3, 1921, in northeastern Maine. 
48108—23 - 7 
