1905] BRIEFER ARTICLES 451 
(jig. 1) and the Artemisias in the shape of the separate branches. It seems 
probable that this mode of growth is of use in removing the foliage of the 
plants as far as possible from the intensely heated cliff surfaces. 
The plants in question show few adaptations for extraordinary collec- 
lion or storage of water. The roots of the Artemisias are often twice or 
more than twice 
as long as their 
stems, but the 
other four species 
have compara- 
tively short roots. 
In all six species 
the means of 
checking foliar 
ttanspiration are 
only moderately 
developed. Most 
of them during the 
Tainy season 
transpire ab Teh a 
dantly. The loss 
Per hour per 100 
square centimeters 
of leaf surface 
(reckoning lower 
Surfaces only) for 
“Matthiola is 
O61™8, Helichry- 
sum 750%, Med- : 
Kag0 1200™8, and Fic. 1.—Helichrysum rupestre (left), Matthiola rupestris 
Inula T431™8, at (right). May condition. 
4 temperature of : 
about 30° C., when the moderately xerophytic leaves of the olive lose 
450™ per hour. The leaf areas for the finely dissected leaves of oF 
Attemisias were difficult to calculate, so twigs of these were pug.aee 
With olive twigs by weight, and the loss per gram per hour os — st 
of Artemisia was found to be about 190™® when the loss of an olive twig 
Was Gong, 
: eae may 
Putting the means of checking transpiration in tabular form, they ma) 
be indicated as follows: 
