PLATE 4 
Photomicrographs showing cross sections of “tumor strands” and “secondary 
tumors” taken from Plate 3, B. 
A. —A “tumor strand,” st, which appeared in sections taken between b and c of 
Plate 3, B. It may be seen that some of the walls around certain intercellular spaces 
have taken the stain much more heavily, e, but that no proliferation has occurred 
about them. X224. 
B. —A section through the “secondary gall,” c, of Plate 3, B. The position marked 
X is directly above and in line with the strand shown in A of this plate. A portion 
of the pith, f, and of the vascular tissue, g, of the stem may be seen at the left. X56. 
C. —A “tumor strand,” st, which appeared in sections cut between c and d of 
Plate 3, B. Here also the walls have a changed staining reaction, and a few cell divi¬ 
sions have taken place. 
This strand is directly above and in line with the position marked X on B of this 
plate. X224. 
It may be noted that the “tumor strands” and “secondary tumors” so far examined 
have had no connection with any vascular tissue. 
D. —A section through the “secondary gall, ” d, of Plate 3, B. The position marked 
X is still directly above and in line with the strand shown in C of this plate. A portion 
of the pith, f, and of the vascular tissue, g, of the stem may be seen at the left. In the 
gall proper vascular tissue has developed in a more or less spheroid mass. It has no 
connection with any of the vascular elements of the stem proper. X56. 
