334 
Journal of Agricultural Research voi. xxiii, No s 
variety originating near the Caspian Sea. The Jet is a 2-rowed naked 
variety from Abyssinia which develops a very black pigment in the 
pericarp at maturity. As the occurrence of this pigment is thought 
to be of significance in the later stages of maturation, the Jet variety 
is considered the basic one in the discussion which follows. The growth 
Fig. i.—A verage length, lateral diameter, and dorsoventral diameter of kernels of Jet barley at Aberdeen, 
Idaho, in 1920. 
and maturation of the Baku variety vary somewhat from those of the 
Jet. These differences are apparent in the tables and figures and are 
pointed out in the discussion. In the figures which give data from the 
Baku variety for both 1919 and 1920, the time from flowering is for the 
1920 data. The Baku variety in 1919 is advanced three days to avoid 
confusion of the lines. The shorter growing season of the Baku variety 
in 1919 was doubtless the direct result of drought, as the water for irriga¬ 
tion was insufficient in that year. 
