8 
BULLETIN 137, IT. S. DEPARTMENT OF AGRICULTURE. 
of a whole centgener, and strains that are three days apart are 
unbelievably dissimilar when viewed at this time. 
This note was taken for 
a large number of selec- 
tions for three years to test 
the transmissions of slight 
variations in earliness and 
lateness. The evidence 
seemed all in favor of ac- 
crediting to this character 
a heritability equal to that 
of most plant characters. 
The data are too cumber- 
some to include entire, but 
a random selection of 
strains of one general type 
is given in figure 5. The 
variations are parallel, on 
the whole, especially when 
it is remembered that the 
centgeners were often sep- 
arated by considerable dis- 
tances, allowing variations 
in soil and moisture. The 
exceptions are fully as 
likely to represent differ- 
ences in the character of 
the strains, causing them 
to respond differently to 
different seasons, as they 
Fig. 4. — Curve showing summary of data on the ' " 
emergence of the awns in 13,108 plants from are to question the Value 01 
various selections of barley. ^\±q note. 
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Fig. 5. — Curve showing the effect of season upon the relative date of the emergence 
of the awns in 37 selections of 6-rowed barley grown at St. Paul, Minn., in 1911, 
1912, and 1913. 
