380 



GENETICS IN RELATION TO AGRICULTURE 



Fio. 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.) 



FIG. 157. Microscopical 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 



FIG. 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 a would produce a sectorial chimera, while one arising at b would form 

 a periclinal chimera. (After Baur.) 



