884 
Journal of Agricultural Research 
Vo!. XXIII, No. n 
vegetative shoots encircling the flower buds soon begin to elongate, 
and the latter apparently is deprived of the necessary nutrition for 
development. It should be pointed out that in this experiment the 
formation of flower buds in all cases was associated with marked branch¬ 
ing at the tops of the plants, while branching did not occur in those 
plants in which flower-bud formation was inhibited by the lengthened 
light exposure. 
A similar experiment was undertaken with Biloxi soybeans. The 
seed, sown in 12-quart buckets, germinated July 2, and at the outset 
all seedlings were exposed to a io-hour day. Beginning July 6 one lot 
of seedlings was transferred each succeeding day to permanent outdoor 
conditions, the last lot being transferred July 25. The results are shown 
in Table IV. The response to the change in the light period is similar 
to that of Cosmos. Here, again, 10 days’ exposure to short-day con¬ 
ditions was the minimum for inducing flower formation. All plants 
thus responding also flowered again at the normal time for the variety 
in early fall as a result of the natural shortening of the day. It will 
be observed that although flowering was successfully accomplished where 
the soy beans were exposed to the io-hour day for 10 to 20 days no fruits 
were developed, a fact which is regarded as important. Although the 
blossoms appeared to be normal it seems that under the influence of 
the long-day exposure even the stimulus of fertilization was not sufficient 
to permit development of the seed. Beginning with an exposure to 
the io-hour daily light period for 11 days the fruits in increasing numbers 
were successfully developed. 
Table IV .—Effect of transferring Biloxi soybeans at intervals of one day from a 10-hout 
daily light exposure to the full daylight period of summer 
ate trans¬ 
fixed to 
all day¬ 
light. 
Date of 
opening 
of first 
blossom. 
Date of 
second 
(normal) 
blossoming 
period. 
Aver¬ 
age 
height 
of 
plants. 
Seed formation. 
Inches. 
ly 6 
Sept. 13 
42 
No pods formed. 
7 
.. .do. 
42 
Do. 
8 
Sept. 14 
42 
DO. 
9 
Sept. 13 
42; 
Do. 
10 
...do. 
42 
Do. 
11 ! 
. .do. 
. 
421 
Do. 
12 ! 
Aug. 9 
Sept 15 
42 ! 
! No pods formed from first blossoms. 
*3 
...do. 
Sept. 14 | 
42 
Do. 
14 | 
...do. 
...do.| 
i 42 
Do. 
*5 ; 
July 31 
.. .do.i 
40 
Do. 
16 
...do. 
...do. 
40 
Do. 
17 
i.. .do. 
...do. 
1 40 
Do. 
18 
.. .do. 
...do. 
40 
Do. 
19 
July 27 
...do. 
39 
1 Do. 
20 | 
1 July 26 
...do. 
! 38 
! Do. 
21 
...do. 
...do. 
3 6 
Do. 
22 
...do. 
...do. 
! 3 6 
Do. 
23 
.. .do. 
...do. 
A few pods formed from first blossoms. 
24 
I...do. 
...do. 
l O J 
32 
Numerous pods formed from first blossoms. 
25 
...do. 
...do. 
28 
Do. 
