_Ig14] HASSELBRING—EFFECT OF SHADING ~— 279 
weight of the two sets was the same, approximately 188 grams. 
A more marked contrast even is brought out by a comparison of 
the distribution of material in the different organs of the plants. 
The weight of dry substance in the roots was practically identical 
in the two groups. The stems of the shade plants contained 18 
per cent more dry matter than those of the sun plants, but the 
leaves of the sun plants contained 11 per cent more material than 
the leaves of the shade plants, although the average total area of 
shade leaves, as shown in table VII, was 37 per cent greater than 
that of the sun leaves. To recapitulate, the fresh weight of the 
shade plants was higher than that of the sun plants. This state- 
ment applies also to the leaves and stems when the organs are con- 
sidered separately, but not to the roots, which were about equal 
in the two sets. The average dry weight of the whole plants and 
of the roots was the same in the two sets of plants; but the weight 
of dry material in the leaves was greater for the sun plants, while 
that of the stems was greater for the shade plants. 
These facts show that on the whole the water content of the 
TABLE X 
PERCENTAGE OF WATER IN LEAVES, STEMS, AND ROOTS 
Opr 
No. of plant Leaves Stems Roots Total 
bliin cdma ee 
I 
Ae ee 79.82 79.92 78.29 79-49 
< Gig ieee 81 <g 82.17 79.27 81.28 
Prince... 82.68 82.87 79-75 82.11 
Oe ory ae 79.97 81.76 76.43 reg 
Se 81.95 83.01 78.13 Sy Gs 
ae 82.36 81.74 79.65 81.55 
Average 81.39 81.91 78.59 81.01 
SHADE 
16 82.61 
eas: 84.12 82.21 80.75 . 
- Rees. < 84.27 83.21 77-86 Ba. 04 
* ee 85.78 83.70 79-19 83.79 
a Piles Se 87 o7 84 O7 79 18 84 5° 
