IOWA ACADEMY OP SCIENCE 
33 
Kind of Seed and Treatment 
Col- 
lected 
Plant- 
ed 
Days Dormant 
Per cent 1 i 
Germi- || 
nation 1 
Soft Maple — 
1. Placed in damp cloth; be- 
came slightly mouldy. . 
2. Placed in paste board box 
in laboratory and kept 
dry 
6- 3-09 
6- 7-09 
7th day, 2; 8th, 23; 9th, 7; 
10th, 2; 11th, 6; 12th, 2; 
13th, 1; 14th, 1; 15th, 
2; 16th, 1; 22d, 2 
75 
6- 3-09 
6- 7-09 
8th, 5; 9th, 12; 11th, 4; 
12th, 3; 13th, 2; 14th, 1; 
15th 1; 17th, 1 
58 
3. Picked from the ground. 
4, Kept in laboratory and al- 
lowed to dry out. Seeds 
had become much more 
6- 3-09 
* 
9th, 1; 10th, 1; 11th, 4; 
12th, 8; 13th, 6; 14th, 1; 
15th, 1; 16th, 3; 17th, 3; 
18th, 4; 21st, 2; 22d, 1; 
26th, 5 
40 
shriveled than they were 
in sample No. 2, but 
still green 
6- 3-09 
6-18-09 
11th, 10; 13th, 3; 17th, 4; 
19th, 1; 20th, 1; 28th, 1; 
29th, 1 
42 
5. Seeds collected from the 
ground. In fairly good 
condition. The cotyle- 
dons were green 
6-18-09 
6-18-09 
1 
1 
7th, 1; 8th, 2; 9th, 2; 10th, 
2; 11th, 17; 13th, 3; 
14th, 2; 15th, 1; 16th, 1; 
20th, 1 
6. Kept in laboratory. Same 
condition as No. 2. Seeds 
32 
had become very much 
shriveled and dried out 
6- 3-09 
6-26-09 
13th, 1; 15th, 1; 17th, 1.. 
6 
7. Seeds kept in cooling 
room at the creamery at 
the following tempera 
ture: 45°P. Seeds slight- 
ly shriveled but the coty- 
ledons green. Plants 
are not mouldy 
i 
i 
7- 7-09 
6th, 1; 7th, 0; 8th, 1; 9th, | 
6; lOth, 6 1 
I 
1 
[ 
28 
It appears from these tests that the soft maple having a very thin 
seed coat does not retain its vitality for a great length of time because 
the loss of water is very rapid. Germination may be delayed by keeping 
the seeds at a nearly uniform temperature in a refrigerator or cooling 
room. Of one hundred seeds collected on July 5th from under the 
trees where they had fallen, none were found which were capable of 
germination. Many of them, or nearly all of the seeds were decomposed. 
^Immediately. 
3 
