Freezing Injury of Seed Corn 
45 
Table 9 (Continued) — Effect of freezing temperatures on ger- 
mination of corn differing in moisture content (1913 and 191Jf) 
Temperature range 0° to — 5°F. 
Germination 
Ice 
Moisture 
range 
Embryos dark 
or light 
Moisture 
in grain 
Normal 
Frozen 
Ratio 
of normal 
observed 
in grain 
grain 
grain 
to frozen 
Per cent 
Per c nt 
Per cent 
Per cent 
24.8 
100 
0 
100:0 
Ice 
Dark 
24.5 
100 
0 
100:0 
None 
Dark 
24.4 
100 
0 
100:0 
* 
Dark 
20 to 25 . . 
22.3 
100 
0 
100:0 
None 
Light 
21.5 
100 
0 
100:0 
* 
Dark 
' 
21.2 
100 
0 
100:0 
* 
Medium dark 
20.5 
100 
0 
100:0 
Ice 
Dark 
Average. . 
22.7 
100 
0 
100:0 
20.0 
100 
20 
100:20 
None 
Dark and light 
19.9 
ICO 
0 
100:0 
Ice 
Dark and light 
18.9 
100 
60 
100:60 
* 
Light 
15 to 20. . 
18.4 
| 100 
20 
100:20 
* 
Medium dark 
10.3 
100 
100 
100:100 
None 
Light 
15.6 
100 
100 
100:100 
None 
Light 
15.5 
I 100 
100 
100:100 
* 
Light 
15.3 
! 100 
100 
100:100 
None 
Light 
Average . . 
17.5 
100 
62.5 
100:63 
14.8 
100 
100 
100:100 
* 
Light 
14.4 
100 
80 
100:80 
* 
Light 
10 to 15. . 
14.3 
1 13.6 
100 
100 
100 
100 
100:100 
100:100 
* 
None 
Light 
Light 
| 13.0 
100 
100 
100:100 
None 
Light 
[ 11.9 
100 
100 
100:100 
None 
Light 
Average . . 
13.7 
100 
96.6 
100:97 j 
i 
*No observations made. 
SUMMARY OF GERMINATION TESTS UNDER CONTROLLED CONDITIONS 
A summary of the average germinations of corn exposed to 
the different ranges of temperature, and containing various 
amounts of moisture, is given in Table 10. The data in this 
table are taken from the detail tables for the different tempera- 
ture ranges. It will be noted from this table that (1) as the 
moisture content of the corn diminishes, the injury (with some 
