EXPLANATION OF THE ILLUSTRATION 
Prare X. Projection tracings of comparable cross- 
sectional views of the outer pistillate glume as this 
organ is affected by certain genes. In each figure 
the outer (abaxial ) epidermis is uppermost. 1,papy- 
rescent (Pn); 2, tunicate (7'w): 3, normal; 4, 
vestigial glume (J/g). About 80 times natural size. 
Drawn by Wavron C. GALinat 
