ZIGZAG CULMS OF THE MORE EXTREME TYPE 
Comparison of these culms with the normal one shown in Figs. 11 and 12, indicates plainly that 
the internodes of a zigzag plant are not only shortened but also considerably thickened, indicating 
a more rapid growth on the side of the internode affected. These are extracted recessives from 
crosses and, together with those in Figures 8 and 9, show that there is a considerable variation 
in the expression of the zigzag character. The short twist high on the second and third plants is 
another abnormality not of the zigzag character. (Fig. 14.) 
