380 GENETICS IN RELATION TO AGRICULTURE 
Fic. 156.—Sections through edges of the two leaves shown in Fig. 155. Green tissue 
indicated by stippling. For much enlarged views of the portions enclosed by the small 
rectangles see Fig. 157. (After Baur.) 
Fria. 157.—Microseopical views of those portions of the cross-sections in Fig. 156 
represented by the small rectangles. Colorless chromatophores are indicated in outline, 
green in black. (After Baur.) 
A B 
Fie. 158.—A, Diagram of longitudinal section through a young shoot of a plant bearing 
white-edged leaves—a periclinal chimera. B, Cross-section of stem of a sectorial chimera. 
A bud pushing out at @ would produce a sectorial chimera, while one arising at b would form 
a periciinal chimera, (After Baur.) 
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