altering the Daily Period of Light . 
85 
Average 
height of 
stem. 
Tallest 
plant. 
Total 
zv eight. 
No. of plants 
in ear. 
Total A r o. 
of ears. 
mm. 
mm. 
grm. 
Exposed plot 
585-5 
800 
283.500 
*9 
49 
Darkened plot 
448.7 
662 
191.360 
15 
18 
White Mustard in Open Ground , 1921. 
Seeds were sown on 23 May, and on 2 June forty-two plants were left 
in each plot, the number being afterwards reduced to twenty-seven. The 
period of darkening was exactly the same as for wheat. In the exposed 
plot six plants came into flower on 27 June, and on 30 June eighteen were in 
flower. On the latter date the first plant in the darkened plot came into 
flower. The plants were pulled up on 5 July with these results: 
Exposed plot 
Darkened plot 
Average 
height of 
stem. 
Tallest 
plant. 
Total 
zv eight. 
No. of 
plants in 
flower. 
mm. 
mm. 
grm. 
6i6-o 
790.0 
1006-425 
25 
4607 
647.0 
453 - 59 ° 
17 
Soy Bean No. 1 in Open Ground , 792 /. 
The seeds were sown on 23 May, and on 2 June eighteen plants were 
left in each plot, the number being reduced later to seventeen. The period 
of darkening was exactly the same as for wheat. In the exposed plot two 
came into flower on 4 July, and on 6 July three were in flower. The first 
flower in the darkened plot opened on the latter date. The plants were 
pulled up on 12 July with the following results : 
Average 
height of 
stem. 
Tallest 
plant. 
Total 
zv eight. 
No. of 
plants in 
flower. 
mm. 
mm. 
grm. 
Exposed plot 
452-7 
528 
5 1 7 - 38 o 
17 
Darkened plot 
3 l( 5-3 
399 
226-800 
17 
Soy Bean No. 2 in Open Ground , 792 /. 
The seeds were sown on 23 May, and on 2 June sixteen plants were 
left in each plot, the number remaining the same to the end of the experi¬ 
ment. The period of darkening extended from 2 June to 25 June and 
comprised eighty-four hours. In both the exposed and darkened plots the 
first two flowers appeared on 2 July. The plants were pulled up on 
11 July with these results : 
Average . 
height of 
stem. 
Tallest 
plant. 
Total 
weight. 
No. oj 
plants in 
flozver. 
mm. 
mm. 
grm. 
440-4 
555 
467.760 
15 
358 -I 
446 
262-240 
16 
Exposed plot 
Darkened plot 
