442 



Journal of Agricultural Research 



Vol. VI, No. la 



Table III . — Coefficien t of variation of characters in first- and second-generatio n maize p lants 



Character. 



Height cm.. 



Length of branching 



space cm. . 



Length of central spike, 



cm 



Nmnber of branches 



Number of secondaries . . 

 Number of nodes above 



ear 



Length of longest leaf, 



cm 



Width of longest leaf. 



Ratio of length to width. 

 Number of nodes above 



longest leaf 



Total number of nodes . . 

 Number of sheaths with 



hairs 



Number of sheaths encir- 

 cled by hairs 



Length of hairs. . . .mm. . 



Density of spikelets 



Length of gliunes. .mm. . 

 Number of erect blades . . 

 Angleof tassel axis. ..( °) . . 



One-sidedness 



Number of rows, upper 



ear 



Number of rows, lower 



ear 



Ntunber of husks, upper 



ear 



Number of husks, lower 



ear 



First 

 genera- 

 tion. 



. o± o. 

 •3i !■ 



5± I- 

 3± 2- 

 4± 4. 



7 14- 7± 1-5 



8 20. 4± 1.9 



19. 7± 2.0 



27. o± 2.7 



40. 4± 4. 2 



4± I. 

 4± • 



.o± 2. 

 •3± • 



l± I. 



2± .1 



I± I- 2 



4± 2. 



3± 2. 



7± I- 



A± 6. 



2± 



6± 6 



8.9 



7± I.- 



6± 2.( 



i± I., 



3± 2-< 



Second generation. 



Ear I. 



Plants 

 from 

 waxy 

 seed. 



17. 4± 1-7 



8.i± .7 



10. 7± i.o 

 ii.o± 1.0 



18. 4± 1.7 

 10. 9± I.I 



26. 2± 2.5 



[70. o±42.o 



19. 7± 1.9 



20. 2± 1.9 

 9-I± .9 



68. 7± 9.8 

 98. 2 ±16. s 

 48. 8± 5.7 



20. 7± 2. s 



IS- S± 2.S 



24. 6± 2.6 



23. i± 3.6 



Plants 

 from 



horny 

 seed. 



i3-o± I. 



19. 6± I. 



lS-2± I- 



25. 2± 2. 



42. 4± 4. 



i7-3± I- 



8.2± . 



iS'li I- 



10. 7± I. 



I7-S± 1-6 



19- 8± I. 

 83.4±ii- 



17. 2± I. 



36- 2± 3. 



6.8± . 



66. 9± 9. 



66. 7 ± 7. 



56. S± 7- 



17. 2± I. 



19- 9± 3. 



20. 6± 2. 



14. 4± 2. 



Ear 2. 



Plants 

 from 

 waxy 

 seed. 



i4-5± 1-4 



15- 8± 1.5 



13- 8± 1.4 



17- 5± 1-7 



43- 6± 4-7 



9. 6± 1.0 



6.7± -8 



10. 4± 1.0 



10. 2± 1.0 



14.2+ 1.4 



6.8± .7 



29. 4± 3.2 



169. 0±42.O 



l8.s± 1-9 



29- 7± 3- I 



10. 2± 1.0 

 60. 6±io. I 

 74-4±io.4 



49. 6± 6.6 



I3.8i 1.8 



12. 4i 1.6 



18. 8± 2.0 



II. 6± 1.8 



Plants 

 from 



homy 

 seed. 



19. o± I. 

 18. 3± 1.7 

 I7.5± 1.6 



22-0± 2.1 



41. 9± 4.6 



l4-3± 1-4 



9. 7± 1.0 



8.2± .7 

 10. s± 



2i.8± 1.9 

 9-i± .9 



26. 4± 2-5 



I32.0±25.O 

 10. 4± 1.0 

 19. 8± 1.9 

 lo.5± 1.0 

 75. o± 9.8 

 89. 5 ±13. 1 

 52. 6± 6.4 



13- 7± 1-4 



15. o± 2.0 



20. 2 ± 2.1 



i9-5± 2-4 



Ear 3. 



Plants 

 from 

 waxy 

 seed. 



14. 9± !•' 



22. o± 2. 



II. 6± 1., 

 22. o± 2. 

 62. o± 9. 



8.3± .' 



8.7± .. 



12. S± I., 

 12. 9± I.. 



18. 8 ± 2.( 



8.o± i.( 

 23-3± 2.5 



15-8 



o±78. 

 6± 2. 

 6± 2. 

 i± I. 

 2± 8. 

 9±I2. 

 4± S- 



7± I- 



8± I. 



3± I- 



± 2. 



Plants 

 from 



horny 

 seed. 



.o± 1.8 

 .6± 2.2 



• 7± I-O 

 ■i± 3-3 



. 2±II.6 



. 4± I.I 



.4± 1.0 



.4± 1-9 

 •7± 1-3 



• i± 1.4 



•7± -7 



19. i± 2.1 



o± so. o 

 3± 2.3 

 8± 2.8 



S± 1-7 

 3± 7-5 

 o±i8.6 

 8± 6.3 



3± 1-9 



o± 1.9 



7± 2.6 



o± 2.5 



A comparison of these tables shows that the first-generation plants 

 exceeded the second-generation plants in height, length of branching 

 space, length of central spike, length and width of longest leaf, number 

 of nodes above the longest leaf, number of leaf sheaths with hairs, 

 and number of single-ranked blades. The second-generation plants 

 exceeded the first-generation plants in the number of tassel branches. 

 In the other characters there was no significant difference between the 

 means of the first and second generation plants. 



The first-generation plants were distinctly less variable than the 

 second-generation plants in height, length, and width of longest leaf, 

 number of nodes above the longest leaf, total number of nodes, and 

 number of leaf sheaths with hairs. The first-generation plants were more 

 variable with respect to the length of the tuberculate hairs and density 

 of spikelets. 



The least variable character measured was the length of the longest 

 leaf. Thctotal number of nodes was also comparatively, uniform. The 

 very high coefficient of variation for the number of sheaths encircled by 

 hairs results in part from the alternative nature of this character. 



