BULLETIN 137, U. 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 



Pig. 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. ^g 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. 



