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56
with air-currents offer may involve certain constant differences in
the results. The maximum values obtained by me for Nasturtium
and Atriplex are also somewhat higher than those found by GILTAY
(1898), Brown and EscomsBeE (1905), and BovsEN-JENSEN (1918) with
the air-current method.
My values too sometimes diverge considerably from each other,
a fact which is probably due to the lack of homogeneity in the
material. A greater number of experiments would have rendered
possible a more accurate knowledge of the shape of the curve.
For my purpose, however, the experiments carried out give suffi-
cient information.
Ma eo
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Fig. 3. Diagram showing the influence of different intensities of light upon the
CO, assimilation of Nasturtium palustre. Atriplex hastatum shows a similar but
higher curve.
The culminating point of the assimilation is reached in the plants
of my experiments at the following values:
Sun plants {Atriplex latifolium 8.s mg. per 50 cm.? per 18° per1,hour
|Nasturtium palustre 6.0»! » > > »
Oxalis Acetosella... 2.4 » > » »
3 Melandriumrubrum 1.7 > » 153 » »
Shade-plants, ,,. ;
Circea alpina......... 1,1» » » » »
Stellaria nemorum 1.45 » » 73 » »
From the figures it clearly appears that the sun-plants have a
far greater power than the shade-plants of utilising the available
* This value is possibly somewhat too low, since the highest light-intensity
employed in this series was 1:2.
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