Bui. 1074, U. S. Dept. of Agriculture. 



Plate XLVIII. 



Prelude 'A;. 



Humpback (B). 



Spike, '■ ■ ' • from lo er, central, and uprier portions of spike, natural 



ilzc; kernel In three positions and in tran rei e icetion, magnified 3 diameters. 



