DISTINCTIONS IN CULTIVATED BARLEYS. 
15 
In length of leaf, the method is much less promising. Not only 
is the probable error greater, but the measurement is unsatisfactory. 
The leaves become so broken by whipping in the wind that speci- 
mens which are entire at the tip are seldom found. An effort was 
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Fig. 8. 
-Composite curve showing the width of leaves in millimeters in eight selections of 
barley. 
made to overcome this difficulty by choosing an earlier stage of 
development and thus utilizing the better protected leaves nearer 
the ground. Although the extreme tendencies were not yet devel- 
oped, the second leaf from the seedling was found to offer fewer 
experimental difficulties. Such leaves were entire and the length 
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Fig. 9.— Composite curve showing the length of leaves in centimeters in six selections of 
barley. 
measurements accurate, but even then the width was much less 
variable than the length. All measurements, consisting of 100 leaves 
of each strain, showed a sharp curve in width, but a flat one in 
length, the latter sometimes having two summits. Composite curves 
are shown in figures 8 and 9. 
