Variation and Correlation of Oats — Part I 



35 



Correlation of total yield of plant with other characters 



The correlation between total yield of plant and average yield of culm 

 per plant (Figs. 25, 26, 27), determined for three years, varies from 

 .692 ±.018 for 1912 to .761 ±.013 for 1909. This correlation is very 

 high, positive, and stable — as would be expected, in fact. It is not by 

 any means perfect correlation, however, this being due to the method 

 of development in the oat plant. All culms do not develop equally, 





IN 



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3 



3 























1- 2 







4 



10 



22 



8 



7 



5 



5 

















1 





2- 3 











10 



18 



28 



20 



12 



4 



2 





1 



1 











3- 4 













3 



15 



17 



29 



14 



12 



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4- 5 















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12 



27 



22 



7 





4 



2 









5- 6 



















2 



6 



7 



11 



11 



10 











6- 7 

















3 



4 





5 



7 



10 





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3 





7- 8 

















1 



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8- 9 





















1 





1 



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3 





1 







9-10 























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1 













10-11 



























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11-12 



























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12-13 



































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13-14 























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3 3 7 16 33 32 56 53 65 58 55 39 30 27 

 Fig. 25. — Total yield of plant in grams, subject 



10 



Average yield of culm per plant in grams, relative. 1909 

 Coefficient of correlation = .761 ± .013 



25 



62 



96 



96 



81 



47 



40 



31 



10 



2 



5 



2 



1 



2 



500 





". 



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1 



CD 



1 



^ 



1 



1 

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7' 



1 



3 



3 



1 1 



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1—1 1—1 





0-1 



1 



1 











1 

















3 



1-2 



2 



5 



13 



9 



5 



6 



10 

















50 



2-3 



1 



1 



5 



13 



25 



25 



18 



6 



5 



4 



2 



1 







106 



3-4 









5 



9 



24 



28 



16 



18 



7 



1 





1 





109 



4-5 









1 



2 



6 



6 



31 



17 



10 



3 



3 



1 





80 



5-6 















2 



7 



7 



11 



13 



2 







42 



6-7 

















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2 



3 



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7 



7-8 

























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1 



2 



8-9 

























1 







1 



4 7 18 28 41 61 65 61 49 35 20 



1 



Fig. 26. — Total yield of plant in grams, subject 



Average yield of culm per plant in grams, relative. 1910 

 Coeffi/cient of correlation = .694 ± -01 7 



400 



