388 RAY C. FRIESNER 
Table i. Pisum sativum. Elongation of Plants iqj and IQ4 {Smooth-seeded variety) 
Time 
Temp 
193 
194 
10 A.M 
20.3 
0.912 
I-I35 
II 
20.8 
0-955 
1.867 
1,045 
2,1 80 
12 M 
20.8 
I P.M 
20.6 
0.706 
T e;6t 
1.501 
0.055 
1-755 
2 
21.0 
o.7«4 
0-855 
3 
21.0 
1.900 
0.765 
1 .620 
4 • • • 
21.0 
1. 1 80 
0.837 
1.045 
5 
21.0 
2 
.017 
0.977 
2.022 
6 
21.0 
1 .180 
7 
21.2 
0.675 
T "ZQ^ 
^ -oyj 
I-I35 
2.315 
8 
21,0 
0-315 
0.900 
9 
21.0 
0.225 
0.540 
1. 000 
1,900 
10 
21.2 
0.651 
1.085 
II 
21.0 
0.457 
1. 108 
0.865 
1-953 
12 N 
21.0 
0.708 
0.955 
I A.M 
21.0 
0.425 
I-I33 
0.888 
1-843 
2 
0.475 
0.850 
3 
21.0 
0.475 
0.950 
0.850 
1.700 
4 
21.0 
0.750 
0.600 
5 
21.0 
0.884 
1.634 
0.791 
I-39I 
6 
0.675 
0,972 
7 
21.0 
0.675 
1-350 
0,972 
1.944 
8 
0.585 
0,522 
9 
21.0 
0.585 
1. 1 70 
0,522 
1.044 
hours or forward 15 hours. The justification for this will be discussed later 
in connection with curves for cell division. The times of maxima and 
minima for plants given in table 2 are rewritten there on the basis of having 
started at 9 A.M. The lack of uniformity at first apparent disappears when 
Table 2. Pisum sativum. Grouping of Maxima and Minima of Elongation, 
Wrinkled-seeded Variety 
Plant 
Maxima 
Minima 
155- • - 
12 M. 
10 P.M. 
4 A.M. 
10 A.M. 
8 P.M. 
2 A.M. 
159. . . 
2 P.M. 
10 P.M. 
6 A.M, 
10 A.M. 
6 P.M. 
4 A.M. 
160. . . 
2 P.M. 
8 P.M. 
4 A,M. 
12 M. 
6 P.M. 
2 A.M. 
165... 
2 P.M. 
8 P.M. 
4 A.M, 
10 A.M. 
6 P.M. 
2 A.M. 
169. . . 
4 P.M. 
8 P.M. 
6 A.M. 
12 M. 
6 P.M. 
4 A.M. 
170. . . 
2 P.M. 
10 P.M. 
4 A.M, 
12 M. 
8 P.M. 
6 A.M. 
174- • - 
6 P.M. 
12 N, 
10 A.M. 
2 P.M, 
8 P.M, 
8 A.M. 
175- • • 
10 P.M. 
12 N, 
10 A.M. 
4 P,M. 
2 A.M. 
2 P.M. 
12 N, 
6 A.M. 
8 A,M. 
8 P.M. 
12 N. 
Summary 
Maxima 2-6 P.M. 8-12 P.M. 4-6 (lo)^ A.M. 
Minima 10 A.M,-2 P,M. 6-8 P.M. 2-4 (6)^ A.M. 
Smooth-seeded Variety 
Plant 
Maxima 
Minima 
193- • • 
194. , . 
5 P.M. 
7 P.M. 
I A.M. 
II P.M. 
5 A.M. 
7 A.M. 
I P.M. 
3 P.M. 
9 P.M. 
9 P.M. 
3 A.M. 
5 A.M. 
Parentheses indicate an occasional variation in time to that enclosed by them. 
