Variation and Correlation of Oats — Part I 31 



12 13 14 15 16 17 18 19 

 55-60 



60-65 



65-70 



70-75 

 75-80 



80-85 



85-90 



Chart 6. — Regression for average height of plant and 

 average weight of kernels for 1912, from Fig. 18 



The regression lines have been determined for the average height of 

 plant and average weight of kernels for the three years 1909, 1910, and 

 1912. These are shown in Charts 4, 5, and 6. 



The correlation between average height of plant and average number 

 of spikelets per culm per plant (Figs. 19, 20, 21), determined for three 



o 



25-30 

 30-35 

 35-40 

 40-45 

 45-50 

 50-55 

 55-60 

 60-65 

 65-70 

 70-75 

 75-80 



1 



,k 



A 



1 



A 



■^ 



1 

 o 



1 



1 

 o 



.h 









r-H 



est 



(M 



CO 



CO 



"* 



-* 



3 



1 



















5 



1 



1 

















9 



15 



2 



1 















13 



50 



11 



2 















3 



74 



55 



15 



3 





1 











35 



101 



66 



30 



4 





1 









9 



36 



76 



48 



21 



4 



2 









1 



7 



18 



30 



18 



5 



4 











2 



7 



5 



7 



3 





2 



1 









2 



5 

 2 



6 



1 





1 





33 186 215 187 123 56 14 7 3 1 



Fig. 19. — Height of culm in centimeters, subject 



Number of spikelets per culm, relative. 1908 

 Coefficient of correlation = .699 ± .012 



4 



7 



27 



76 



151 



237 



196 



83 



27 



15 



2 



825 



