Crown-gall Studies ot Resistant Stocks for Prunus 
Plate 2 
A. —Artificial inoculation on a susceptible variety of Prunus mume 
(S. P. I. 45523). The galls are typical crown-gall hypertrophies. July to 
December, 1922 
B. —Artificial inoculations on a resistant variety of Prunus mume (S. P. I. 
47950). Small pointlike hypertrophies are at the margins of the healing 
tissue. These hypertrophies, for the most part, do not increase in size. 
They are thought to be characteristic of resistance in Prunus. July to 
December, 1922 
