( 1026 ) 
Light energy Magnitude of the maximal Number of observations 
in M.C.S. *) curvature in mm. 
7.6 0.7: 12 
12.4 0.96 6 
14 1.47 10 
26.1 21 6 
44.2 2.8 15 
54.0 5.0 i 
65.0 3.4 16 
79.3 3.9 7 
99.0 4.6 13 
126.6 4.6 Bt 
144.0 4.5 LO 
239.0 4.9 10 
576.0 3.6 13 
These figures are found to be on a smooth curve, which therefore 
represents the relation of energy and maximal curvature. 
Fig. 3. 
eb) 
Ee 
= 
=] 
Sj 
Co 
> 
= 
2 6 
Ed 
= 
ae 
a 
= 5 
|= 
9 
5s] 
co 
S 4 
© 
= 
ot 
— 3 
— 
= 
el 
rob) 2 
— 
_ 
= 
Es 
S= 
zen 2 
on pre 
oS “ 
— ~~ 
a a ee ee eee ee 
IJMKS 29 30 40 50 60 70 ' 80 90 100 110 120Mk5 
Energy in MGS. 
The curve gives the relation of light energy used as a stimulus 
and the magnitude of the maximal curvature for plants of 
+ 22.5 mm. length and a temp. of 17.5° Cent. 
1) M.C.S. Means the product of the intensity of the light (in Meter candles) 
and of the length of the exposure. 
