44 
Leitch — . 5 #/^ Experiments on the Influence of 
Table I ( continued ). 
Initial Length . 
Growth. 
Temperature. 
Standard Deviation. 
Probable Error. 
14-33 
13-61 
14-1° 
1-5340 
0-2849 
14-89 
12-65 
14*4° 
2-3581 
0-4105 
13-21 
16-27 
1 6*3° 
2-4438 
0-4389 
16-15 
18-84 
19-9° 
2-2701 
0 - 445 2 
23-63 
18-13 
20-3° 
3-8966 
1-0061 
20-43 
22-49 
22-2° 
2-2871 
0-4402 
20-54 
22-96 
24 - 7 ° 
3 - 7 I 25 
o- 7 i 45 
I 5‘97 
27-20 
27-0° 
3-5358 
0-6064 
I 4’97 
28-26 
2 7 ' 7 ° 
5-0273 
0-8622 
13-16 
29-89 
30 * 3 ° 
2-5092 
0-4436 
i 3*79 
28-37 
31-0° 
4-7522 
0-8150 
i 2'53 
26-93 
33 - 8 ° 
4-2702 
0-7548 
0-0 
- 3 * 5 ° 
14-35 
0-56 
-o- 5 ° 
0-2449 
0-0837 
14-39 
2-38 
2-8° 
0-8400 
0-1420 
12-53 
3-36 
4-0° 
0*6001 
0-1029 
14-47 
3-87 
4 - 5 ° 
1-0738 
0-1869 
* 3*44 
2-31 
i- 5 ° 
0-7079 
0-1197 
Table II. 
Grand Period Experiments. 
The columns give in order (i) the number of the experiment ; (2) the number of days of growth 
before the change of temperature from thermostat temperature ; (3) the temperature of the experi- 
ment ; (4) the day on which the Grand Period occurs ; (5) the growth in mm. on that day ; (6) the 
day on which the side-roots appear ; (7) the length of the main root, in mm., at the end of that day; 
(8) the number of peas measured in each experiment: 
1 
2 3 
4 
5 
6 
7 
8 
1. 
2 1 0°- I 2° 
3 
13*7 
10 
84-5 
3 
2. 
— I 5 °~ I 7 ° 
3-4 
I 4*5 
10 
81 
2 
3 - 
2 1 6° 
3 
18 
6 
85 
1 
4 - 
2 25 0 
3 
33 
4 
87 
1 
5 - 
2 25° 
3 
27 
4 
7 i 
1 
6. 
1 26-3° 
2 
38 
3 
81 
1 
7 - 
2 26-5° 
3 
35 
4 
83 
1 
8. 
2 26-8° 
3 
38 
4 
87 
1 
Conditions uniform from beginning : 
9 - 
23° 
2 
3**5 
4 
85 
6 
10. 
- 14 ° 
3 
19-8 
7 
87 
5 
11. 
— H° 
3 
19-0 
7 and 8 
89 
5 
In Experiment 2 there is no change of temperature ; it is at thermostat temperature throughout. 
