Variation and Correlation of Oats — Part II 161 



straw, and least in the least crowded condition for the first three of these 

 characters; for weight of straw it is least in the most crowded condition. 



Correlations 



The correlations that exist in the two lines under consideration sown 

 at the different rates are given in Tables 15 and 16. Thirteen correlation 

 coefficients for each series have been determined, and these are given 



TABLE 15. Correlations, Series 63, 100, 122. Degrees of Crowding. Pure Line 



50al-18-2 



Average yield of culm per plant, in decigrams — Average height of plant, in centimeters 

 63 r=. 811 ±.015 100. . . . r = .881 ± .009 122. . . . r = .865 ± .010 



Average yield of culm per plant, in decigrams — Average length of head per plant, in 



centimeters 

 63 r=.774d=.018 100. . . . r = .847 ± .011 122. . . . r = .849 ± .011 



Average yield of culm per plant, in decigrams — Average number of kernels per culm of plant 

 63 r=. 906 ±.008 100. . . . r = .930 ± .005 122. . . . r = .908 ± .007 



Average yield of culm per plant, in decigrams — Average number of spikelets per culm of plant 

 63 \=. 845 ±.012 100... r= .885 ± .008 122. . . . r = .851 ± .011 



Average yield of culm per plant, in decigrams — Average weight of kernels per plant, in 



milligrams 

 63 r=. 492 ±.033 100. . . . r = .585 ± .026 122. . . . r = .652 ± .022 



Average yield of culm per plant, in decigrams — Average number of kernels per spikelet of 



plant 

 63. .. r = — .025± .044 100. . . . r = .404 ± .033 , 122. . . . r = .489 ± .030 



Average yield of culm per plant, in decigrams — Diameter of straw, in decimiUimeters 

 63 r=. 765 ±.018 100. . . . r = .882 ± .009 122. . . . r = .866 ± .010 



Average yield of culm per plant, in decigrams — Breaking strength of straw, in grams 

 63 r=. 673 ±.024 100. . . . r= .896 ± .008 122. . . . r = .870 ± .009 



Average yield of culm per plant, in decigrams — Average weight of straw per culm of plant, 



in decigrams 

 63 r=. 919 ±.007 100. . . . r == .941 ± .004 122. . . . r = .901 ± .007 



Diameter of straw, in decimiUimeters — Breaking strength of straw, in grams 

 63 r=. 820 ±.014 100. . . . r = .852 ± .011 122. . . . r = .913 ± .006 



Average weight of kernels per plant, in milligrams — Average number of kernels per culm 



of plant 

 63 r=-. 133 ±.043 100. . . . r= .363 ± .034 122. . . . r =- .466 ± .030 



