Variation and Correlation of Oats — Part II 



179 



Very different results from those that have heretofore been encountered 

 m. these Imes are found when average yield of culm per plant is correlated 

 with average nmnber of kernels per spikelet of plant (Figs. 151 to 156). 

 In both lines there is a graduated increase from the condition of least 

 crowding to that of most crowding. In line 50 the extreme? are found in 

 series 63 and series 122, the respective coefficients being — ■ .025 ± .044 

 and .489 ± .030, an extreme difference of .514 ± .053, which is nearly 

 ten times its probable error. In line 62 the extremes are in series 68 

 and series 118, being .060 ± .039 and .621 d= .024, respectively — an 

 extreme difference of .561 ± .046, which is about twelve times its probable 

 error. There is, then, a decided and significant increase in correlation 

 between yield and number of kernels per spikelet as crowding increases. 

 The means and the standard deviations for the former character decreased 

 with crowding; for the latter character there was not much difference 

 produced by crowding. 



Series 63 



s 



Oi 



s 



UO 





CO 











00 



05 





1— 1 



r-H 



!M 



C^l 



(N 



7 



^ 



->! 



'N 



C<J 



c<« 



7 



7 





00 



s 





1-H 





CO 





»0 





lO 



t^ 



00 



C3 



Totals 



1-2 12 6 11 11 13 



2-3 1 13 1 2 2 1 11 



3-4 2 4 4 4 2 5 4 1 3 29 



4^5 139362 11 26 



&-6 25 15 464 12 1 40 



6-7 12 12 10 35212321 44 



7-8 2 8 7 3 11 11 24 



8-9 1116 4 2 1 1 1 18 



9-10 5 4 2 3 11 1 17 



10-11 13 3 1 1 9 



11-12 13 1 5 



12-13 1 1 2 



Totals 1 8 20 63 51 25 23 14 6 8 10 6 2 1 238 



Fig. 151. — Correlation between average yield of culm per plant, in decigrams, sub- 

 ject; and average number of kernels per spikelet of plant, relative 

 r=- — .025± .044 



