DISTINCTIONS IN CULTIVATED BARLEYS. 
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Pig. 12. — Curves showing the density of 
100 spikes from two selections of Man- 
churia barley grown at St. Paul, Minn., 
in 1913. 
The summits of the curves are separated by only one unit of density, 
but even this is seen to be too great when the entire curves are con- 
sidered. Although the second summit is on 27, there are 46 spikes 
whose density is less than that number and only 12 whose density is 
greater. The actual separation 
is nearer five- tenths of a unit. 
The degree of separation af- 
forded by a difference of only 
two internodes to the decimeter 
is shown in figure 12. These 
are two selections of Manchu- 
ria barley taken at random 
from Table V. By chance, 
they are somewhat more ideal 
than the average strain in the 
same table. A difference of 
only two units in density, when 
taken alone, is perhaps too 
slight a basis upon which to 
separate strains, yet, as is 
shown in the figure, the field 
of actual merging is very 
small. 
The value of this character in the nursery is shown in figure 13. 
These barleys are all closely related pedigreed strains of Manchuria. 
Most of them were from head selections made upon farms in south- 
eastern Minnesota. The curve represents the summits of the curves 
of densities of the 
individual selec- 
tions. The varia- 
tion is consider- 
able and is suffi- 
cient to establish 
some differences of 
itself. It is, how- 
ever, only when 
several characters 
are compared that 
the full value of 
any note is appar- 
ent. For this pur- 
pose, the date of the emergence of the awn is placed also in figure 13. 
As they are in no way parallel, the combination of the two curves 
more than doubles the value of each. It will be noticed that Nos. 3, 
6, and 55 are suspiciously similar, the density and the date of emer- 
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Fig. 13. — Curves showing the average density and the date 
of emergence of the awns in 16 selections of Manchuria 
barley grown at St. Paul, Minn., in 1913. 
