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BULLETIN 137, U. S. DEPARTMENT OF AGRICULTURE. 
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gence of the awns of the three being identical. The records show 
that the emergence was also on the same date the previous year. 
No. 55 is proved to be distinct by the nature of the rachilla, but the 
date of heading, time of stooling, etc., are parallel in Nos. 3 and 6, 
and there is little doubt that they 
are identical. 
While not pertinent to this 
phase of the discussion, the 
curve of density and the curve of 
emergence of beards are almost 
opposite in the Manchuria bar- 
ley. In other words, there seems 
to be a direct correlation be- 
tween density and earliness. In 
figure 14, in which are assembled 
a number of other types of 6- 
rowed barleys that are for the 
most part not closely related, 
this is not true. 
The first five selections, the 
densities of which are shown in 
figure 14, are from a commercial 
variety known as Odessa. This 
so-called variety seems to be a 
loose assemblage of widely varying types, which are, however, ones 
not common in other 6-rowed barleys. The component strains are 
not nearly as closely related as are those of the Manchuria. That 
this variety itself is of hybrid origin or that there has been crossing 
between its members 
is indicated in figure 
15. This selection, the 
most dense of those 
made from the Odessa 
variety, proved un- 
stable. The number 
of plants bearing 
dense heads was 71, 
as opposed to 16 for 
the looser ones. 
While a character 
need not be invariable 
under all conditions in 
order to be useful, a test was made to discover the effect of soil and' 
climate on density of spike. Six selections were planted at St. Paul, 
Minn., at Chico, Cal., and at Aberdeen, Idaho. At Aberdeen they 
were grown both under irrigation and upon dry land. The measure- 
9+ 97 3/ 93 3S // 3* /3 73 32 
Fig. 14. — Curves showing the average 
density and the date of emergence of 
the awns in 12 miscellaneous selections 
of barley grown at St. Paul, Minn., in 
1913. 
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Fig. 15.- 
Odessa 
1913. 
-Curve showing 
(No. 9) barley 
the density of 134 
grown at St. Paul, 
spikes 
Minn., 
