Variation and Correlation of Oats — Part I 



27 





^ 



^ 



s 



s 



g 



g 



8 



8 









1 



i 



1 



s 



1 



^ 



1 





45-50 





2 















2 



50-55 



5 



3 



1 













9 



55-60 



6 



8 



5 



1 



1 









21 



60-65 



2 



9 



18 



4 



1 









34 



65-70 





9 



41 



33 



12 



2 







97 



70-75 





2 



28 



45 



34 



13 



1 





123 



75-80 







3 



26 



27 



24 



9 





89 



80-85 









1 



2 



12 



6 



3 



24 



85-90 























90-95 















1 





1 



13 33 96 110 77 51 17 3 



400 



Fig. 13. 



- Average height of plant in centimeters, subject 

 Average number of kernels per culm per plant, relative. 1910 

 Coefficient of correlation = .732 ± .016 



^ 



i 



i i i 



i 



55-60 



1 1 















2 



60-65 



4 7 















11 



65-70 



7 



22 9 



6 



1 









45 



70-75 



1 



13 30 



59 



32 



5 







140 



75-80 





2 16 



40 



38 



23 



3 





122 



80-85 





1 



12 



26 



23 



9 



2 



73 



85-90 











3 



2 



2 



7 



1 4 16 37 56 117 97 54 14 4 400 



Fig. 14. — Average height of plant in centimeters, subject 



Average number of kernels per culm per plant, relative. 1912 

 Coefficient of correlation =^ .730 ± .016 



The correlation between average height of plant and average weight 

 of kernels per plant (Figs. 15, 16, 17, 18), determined for four years, 

 varies from —.023 ±.034 for 1910 to .555 ±.016 for 1908. This cor- 

 relation is fluctuating and ranges from what is virtually no correlation 

 to a high correlation. From this it must be concluded that the relation 

 between height of plant and average weight of kernels is occasionally close, 

 but that it is responsive to, and is modified by, environment to such an 

 extent that sometimes the two characters may be practically independent 

 of each other. 



