The Editor: Plant Chimeras 



525 



HOW SECTORIAL CHIMERAS ARE MADE 



A, B and C show three different forms of graft, the shaded area representing nightshade and 

 the white area tomato. When cut through at the points indicated by the arrows, the 

 stems present the appearance in cross-section of the circles underneath them. The cut 

 surface forms a calhis, a sort of scab, from which sprouts put forth; if one of them arises 

 directly over the line of union of the two kinds of tissue, it will draw half of its substance 

 from each, as shown in D, where the left-hand side of the plant is tomato and the right 

 hand nightshade. For the purpose of comparison, a nightshade leaf is shown at E and a 

 tomato leaf at G; a chimera-leaf made up of both plants is represented in F. After Wmk- 

 ler. (Fig. 4.) 



