56 o 
Journal of Agricultural Research voi. xxvn, no. s 
Since the correlations are given for both the F x and the F 2 populations, 
it seems unnecessary to discuss them in detail. An examination of the 
coefficients in Table II will show that many of the characters of maize 
tend to remain associated in inheritance, and a comparison of the co¬ 
efficients in this table with those given in Table X for the brachytic hybrid 
and with those given in Table III of the Tom Thumb hybrid show also 
that the associated complex of characters is not the same for these three 
hybrids. Thus, it is apparent that the combination of the large number 
of suckers of teosinte with the multiple-rowed condition of the pistillate 
inflorescence of maize can be obtained more readily in the hybrid with 
crinkly (r = — o.ooo) than in that with brachytic, (r *= — 0.202), though this 
condition could not have been anticipated from the characteristics of the 
maize parents. From the practical standpoint of establishing combina¬ 
tions of the desirable characters of both species, this difference in the 
degree of relationship among the various characters in the several hybrids 
is encouraging in that it affords a basis for predicting that even where 
pronounced correlations are encountered between characters which it 
is desirable to separate, further hybrids with other varieties of maize 
probably will reveal weaker associations between these characters. In 
addition to the many instances of coherence, a study of Table II will show 
many inconsistencies between the Fj and the F 2 , as well as several dis- 
herences which can not be explained satisfactorily in the light of our 
present knowledge. These must await further investigations for proper 
interpretation. 
TablK III .—Coefficients of correlation between the characters commonly affected in the 
modification of normal maize plants to those of the crinkly type a 
Height. 
Central spike. 
[ Branching space. 
Number of 
branches. 
Length of long¬ 
est branch. 
1 
3 
0 
Jd 
ti 
s 
i 4 
Width of blade.* 
Width index. 
i 
V 
43 
in 
O 
1 
»4 
1© 
£ 
1 
i 
u 
V. 
& 
Q 
i 
1 
? 
& 
Q 
Degree color. & 
Generation. 
Central spike. 
Branching space.. 
Number of 
branches. 
Length of longest 
branch. 
Length of blade... 
Width of blade... 
Width index. 
Length of sheath.. 
Degree of crinkly & 
Degree of lobing 6 . 
Degree of color b .. 
Type of plant b > c . 
0.335 
. 119 
• 57 o 
• 14s 
.464 
-.089 
. 618 
.055 
.694 
.441 
—.041 
—. 123 
—•434 
—. 327 
.598 
. 228 
~. 177 
—• 256 
—• 249 i 
6281 
0.195 
—. 032 
. 126 
—•323 
. 622 
. 063 
. 205 
• 134 
. 014 
—.440 
—. 127 
•“•378 
• 373 
.187 
—. 131 
—• i 57 
. 000 
—.316 
6. 542 
—.055 
• 549 
. 114 
. 48c 
. 257 
—.040 
—. 030 
—. 320 
—. 149 
.391 
. 171 
—. 07 8 
-. 186 
*37 
• 452 
0.361 
. 247 
.438 
• 073 
D. 130 
.245 
—. 172 
.138 
• 330 
. 164 
D. 0681 
—. 039 
~• 123 
“• 33 *| 
l 
0. 53c 
—. 105 
—.130 
. 171 
-.417 
. 171 
■ 53 i 
. 119 
—. 267 
—•447 
—. 238 
—. 711 
—0.251 
—. 235 
—. 746 
—. 691 
. 671 
• 530 
—. 290 
-•454 
—•394 
-.883 
0. 788 
. 860 
- 388 
.342 
•445 
• 534 
• 512 
. 619 
—0. 646 
—• 542 
• 502 
.674 
.586 
. 928 
—0. 368 
—.430 
—.419 
-.899 
0.348 
.480 
. 722 
• 
0.495 
. 872 
0. 756 
F» 
F l 
F a 
F 1 
F* 
F 1 
F* 
Fi 
f 2 
Fi 
F* 
Fi 
F* 
Fi 
F* 
Fi 
F* 
F* 
F* 
Fi 
a The coefficients are shown for both Fl and F2. Negative coefficients (indicated by a minus sign) apply to 
those cases in which a high value for one character is correlated with a low value for the other. Fi coefficients 
greater than 0.257 are in excess of three times the error. F2 coefficients greater than .150 are significant. 
Coefficients indicated by D represent disherences. 
b These characters are not found in the Fi. , ; . . 
c The coefficients with type of plant are calculated by the formula for bisenal correlation. Bisenal 
coefficients greater than 0.186 are in excess of three times the error. 
CORRELATIONS BETWEEN CRINKLY CHARACTERS 
The characters which are involved primarily in the modification of 
normal plants to those of the crinkly type have been assembled in Table 
