VI. The Influence of Light upon the Growth of unicellular Organs. 
139 
0.30 
0.30 
... 0.30 — 0.30 
0.12 
_ 
0.12 
_ 
0.50 
. . . 0.50 — 0.30 
— 
0.12 
= 
o.os 
-f 
0.90 
. . . 0.90 — 0.50 
— 
0.12 
= 
0.28 
4- 
1.10 
... 1.10 — 0.90 
— 
0.12 
= 
0.08 
+ 
1.00 
.. . 1.00 — 1.10 
— 
0 12 
= 
0.22 
— 
(light) 
1.10 
... 1.10 — 1.00 
— 
0.12 
= 
0.02 
— 
1.40 
-1.40 — 1.10 
— 
0.12 
= 
0.18 
+ 
1.20 
.... 1.20 — 1.40 
— 
0.12 
= 
0.32 
— 
(light) 
1.4 0 
-1.40 — 1.20 
— 
0.12 
= 
0.08 
— 
1.50 
-1.50 — 1.40 
— 
0.12 
= 
0.02 
— 
The uext experiments were made with the view to determine, which 
rays of the spectrum were especially active in causing this retardalion. 
The following are the measurenienls made upon a hypha which was ex- 
posed at intervals to blue light. 
IV 
Hourly 
growlh. 
Tempera- 
ture. 
8 — 9 
a. m. 
2.20 
24.0 0 C. 
10 
3.00 
24.9 
1 1 
2.20 
26.9* 
12 
— 
2.70 
26.6 
1 
p. rn. 
2.90 
27.8 * 
2 
3.90 
27.1 
3 
t) 
3.90 
27.6 * 
4 
3.90 
26.5 
5 
4.40 
26.1- 
* blue light. 
8 9 to H 42 4 2 3 OS 6 
The average acceleration is here 0.27 per hour. 
2.20 
3.00 
2.20 
— 0.27 
= 
0.53 + 
2.20 
_2.20 — 
3.00 
— 0.27 
= 
1.07 — 
(blue 
light) 
2.70 
_ 2.70 - 
2.20 
— 0.27 
= 
0.23 
2.90 
_ 2.90 — 
2.70 
— 0.27 
= 
0.07 — 
(blue 
light) 
3.90 
_3.90 — 
2.90 
— 0.27 
= 
0.73 -p 
3.90 
. .. 3.90 — 
3.90 
— 0.27 
= 
0.27 — 
(hlue 
light) 
3,90 
3.90 
— 0.27 
= 
0.27 — 
4.40 
- 4.40 — 
3.90 
— 0.27 
= 
0.23 -p. 
The following observations were made upon a hypha exposed to 
yellow light. 
