40 
Research Bulletin No. 2 
INHERITANCE OF LENGTH OF EARS. 
LeDgth oi' the ear of maize is perhaps as good a character 
complex for inheritance studies as is found in the species. It 
is not affected by heterozygosis to as great a degree as height, 
altho some effect may be traced. Like other size characters, 
length of ear is intimately connected in development and in 
Unqth 5 6 7 8 
»». Y*r. 4 2/ 24 8 
13 /4 IS lb 17 /8 /9 20 21 
3 II 12 IS 26 /S to 7 2 
bmeth T B 1 10 II II /3 /V /$ 16 17 l& /9 
fVoyor I IZ /Z 14- 17 9 4 
uiumuii 
7 8 9 /0 // 12 M 74 IS 76 17 18 19 20 Zl 
2 5 17 3i 33 ?3 2* #3 fO ft IZ I 2 I 
Fig. 1. Size of ears of Tom Thumb pop and Black Mexican sweet (top 
row), the F x generation of the cross between these varieties (middle 
row), and the F 2 generation of the same cross (bottom row), — 1-9 
natural size. 
heredity with other complexes, yet it is not so markedly affected 
by external conditions as the height of plant. This statement, 
however, must be considered as somewhat tentative. Length of 
ear may be greatly changed by external conditions, yet if soil 
