PLATE 3 
Crowngall on sweet peas which resulted from inoculation in the condensed region 
of elongation. 
In each case the needle passed through the leaves marked a and struck the stem 
proper at b where “primary galls” developed. “Secondary galls” may be seen both 
above and below this position. Photographed about seven weeks after inoculation. 
A and E. —The inoculation was sufficiently heavy to prevent the bud from expand¬ 
ing. 
C and D.—The region of elongation was partly inhibited from expanding. In both 
cases three nodes above the puncture have developed “secondary galls. ” 
B.—The elongation of the stem was still less inhibited. Serial sections were cut 
through this stem from b through the “secondary gall” d. Photomicrographs taken 
from these sections appear in Plate 4. 
