88 



Clyde E. Leighty 



are, respectively, 38.45 ± 1.20 and 56.18 ± 1.16. These figures express 

 a considerably greater variability in the yield per culm than in average 

 yield of culm per plant. 



TABLE 1. Series 1221 and 22 Compared. In Series 1221 the Indi-vidual Plants 

 ARE Dealt with as Units. In Series 22 the Separate Culms of the Same Plants 

 ARE Dealt with as Units 



Series 1221 



Series 22 



Average j-ield of culm per plant, in decigrams Yield of culm, in decigrams 



M 7.890 ± .118 

 c 3.034 ± .083 

 C 38.45 ±1.20 



M 8.416 ± .109 

 T 4.728 ± .077 

 C 56.18 ±1.16 



Average height of plant, in centimeters 



M 58.683 ± .290 

 a 7.462 ± .205 

 C 12.72 ± .36 



Height of culm, in centimeters 



M 59.971 ± .242 

 a 10.519 ± .170 

 C 17.54 ± .29 



Average number of kernels per culm of plant 



M 55.293 ± .737 

 a 18.942 ± .521 

 C 34.26 ± 1.05 



Number of kernels per culm 



M 58.176 ± .655 

 (T 28.496 ± .462 

 C 48.98 ± .97 



Average number of spikelets per culm of plant 



M31.427± .393 

 a 10.110 ± .278 

 C 32.17 ± .97 



Number of spikelets per culm 



M 32.979 ± .338 

 (T 14.714 ± .238 

 C 44.62 ± .85 



Average weight of straw per culm of plant, in 

 decigrams 



M 10 . 190 ± . 129 

 a 3.317 ± .091 

 C 32.55 ± .99 



Weight of straw per culm, in decigrams 



M 10.781 ± .109 

 a 4.731 ± .077 

 C 43.88 ± .84 



Average weight of kernels per plant, in milli- 

 grams 



M 14.080 ± .066 

 G 1.684 ± .046 

 C 11.96 ± .33 



Weight of kernels per culm, in miUigrams 



M 13.851 ± .058 

 <T 2.540 ± .041 

 C 18.34 ± .31 



The mean for average height of plant in centimeters is less by 1.288 

 ± .378 than is that for height of culm. The standard deviation in the 

 former case is less by 3.057 dz .266, and the coefficient of variability by 

 4.82 ± .46. These figures indicate that the culm is slightly higher when 



