May 3, 1924 
Photoperiodism of Tephrosia Candida 
455 
Table IV.— Leaf measurements on tallest plant, fifth expanded leaf below apex 
cans No. 1 to 24, inclusive , A and B series 
Date measured 
Can 
No. 
Date 
planted 
Age of 
plant¬ 
ings 
when 
Length of 
midrib 
Number of 
pinnae 
Length of 
pinna mid¬ 
way of leaf 
Length of 
terminal 
pinna 
meas- 
ured 
A 
B 
A 
B 
A 
B 
" A 
B 
1921 
Weeks 
Inches 
Inches 
Inches 
Inches 
Inches 
Inches 
Inches 
Inches 
1 
Dec. 21 
22 
4} 
61 
21 
21 
n 
21 
21 
21 
1922 
May 24, 1922. 
2 
Jan. 4 
Jan. 18 
20 
4f 
71 
21 
19 
2} 
31 
2f 
3! 
3 
18 
5 
8 
23 
17 
2 
21 
2 
21 
4 
Feb. 1 
16 
51 
61 
15 
15 
2| 
2| 
2f 
24 
5 
Feb. 15 
14 
6 
71 
17 
17 
24 
3| 
2f 
21 
6 
Mar. 1 
12 
4f 
61 
9 
11 
2| 
31 
21 
3f 
Total.. 
29| 
4.9 
421 
7.1 
106 
100 
13f 
2.3 
18f 
3.1 
141 
2.4 
171 
2.9 
Average. 
17.7 
16.7 
7 
Mar. 15 
22 
6-; 
8f 
21 
23 
24 
2f 
2f 
24 
8 
Mar. 29 
20 
51 
8 
21 
21 
2| 
21 
21 
21 
Aug. 16, 1922_ .. 
9 
10 
Apr. 12 
Apr. 26 
18 
51 
81 
81 
19 
19 
23 
21 
31 
21 
31 
16 
6 
23 
1 ! 
21 
2f 
*24 
11 
May 10 
14 
31 
61 
11 
17 
3 
21 
3 
12 
May 24 
12 
2! 
4| 
7 
11 
if 
2f 
H 
2f 
Total.. 
29i 
4.9 
441 
7.4 
98 
118 
13f 
2.3 
17f 
2.9 
141 
2.4 
16! 
2.8 
Average. 
16.3 
19.7 
13 
June 7 
22 
51 
61 
17 
21 
21 
2! 
24 
24 
14 
June 21 
20 
41 
61 
19 
21 
H 
21 
11 
2f 
Nov. 8, 1922_ 
15 
16 
July 5 
July 19 
18 
16 
61 
81 
71 
17 
21 
2f 
21 
2f 
21 
2f 
24 
4f 
13 
21 
21 
21 
17 
Aug. 2 
14 
3 
6| 
11 
15 
2 
2? 
21 
3 
18 
Aug. 16 
12 
21 
3i 
7 
9 
If 
2 
21 
21 
Total.. 
25" 
361 
6 
84 
108 
121 
2 
15 
13| 
2.2 
151 
2.5 
Average_ 
4.2 
M 
18 
2.5 
19 
Aug. 30 
22 
6* 
61 
17 
19 
2f 
21 
2f 
2f 
2f 
20 
Sept. 13 
20 
n. 
71 
19 
21 
3 
3 
21 
Jan. 31,1923.- 
21 
22 
Sept. 27 
Oct. 11 
18 
16 
6i 
61 
71 
61 
17 
17 
19 
17 
2f 
2f 
2* 
2* 
2| 
2f 
21 
23 
Oct. 25 
14 
4f 
61 
11 
13 
2| 
31 
3! 
31 
24 
Nov. 8 
12 
31 
41 
7 
9 
2 
2f 
2f 
2! 
Total.. 
331 
5.6 
361 
6.1 
88 
98 
151 
2.6 
161 
2.7 
161 
2.8 
161 
2.7 
Average_ 
14.7 
16.3 
*The pinna which should have been measured here was damaged. Entry is mean of that of leaf above 
and below. 
Series B was greater than series A in height in inches to the uppermost expanded 
leaf in each instance in cans No. 1 to 18, inclusive, the difference being 
especially noticeable in the measurements of August 16 on plantings made from 
March 15 to May 24, and in the -measurements of November 8 on plantings 
made from June 7 to August 16. In other words, the differences in height were 
pronounced on plantings which were made between March 15 and August 16, 
and on growth made up to early November (fig. 6). The greatest growth of 
any of the plants measured August 16 was that made during the period of longest 
days (the range from April 27 to August 15 being between 12.8 and 13.2 hours). 
In the measurements made January 31 on plantings of August 30 to November 
8, and on growth made during the period of shortest days (the range from 
November 2 to January 31 being between 11 and 11.4 hours), the difference in 
height was found to be insignificant between the plants receiving a 10-hour daily 
length and their controls which were subjected to the normal day length. 
