24 



H. H. Love and C. E. Leighty 







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1 





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17 



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123 



75- 



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16 



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1 









1 



4 7 IS 28 41 61 65 61 49 35 20 8 2 1 400 



Fig. 6. — Average height of -plant in centimeters, subject 



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



Coefficient of correlation = .7^5 ± .015 













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7 



1 4 6 21 24 25 65 86 55 50 27 25 8 1 2 400 

 Fig. 7. — Average height of plant in centimeters, subject 



Average yield of culm per plant in grams, relative. 1912 



Coefficient of correlation = .7S5 ± .016 



determined for four years, varies from .710±.012 for 1908 to .850±.008 

 for 1909. It is seen from this that the correlation coefficients in both 

 cases are positive and high and that there is a marked degree of stabihty 

 from year to year, but that there is at the same time some response to 

 environment. There is a closer relation between culm yield and height 

 than between total yield and height. 



The regression lines have been determined for the average height of 

 plant and total yield for the three years 1909, 1910, and 1912. These 

 are shown in Charts 1, 2, and 3. 



The correlation between average height of plant and total number 

 of kernels per plant (Figs. 8, 9, 10), determined for three years, varies 

 from .487±.026 for 1910 to .676±.016 for 1909; while the correlation 

 between average height of plant and average number of kernels per culm 

 per plant (Figs. 11, 12, 13, 14), determined for four years, varies from 



