DISTINCTIONS IN CULTIVATED BARLEYS. 



19 



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24- 25 26 27 23 S3 30 3/ 

 OEMS'/TV 



32 33 



merging is very 



Fig. 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 

 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 



to 



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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 25 

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7.5" 77 S3 



67 57 I02 



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. 



