OSMOTIC CONCENTRATION OF TISSUE FLUIDS 283 
Herbaceous Plan is 
Anthurium scandens (Aubl.) Engler 
A 
= 0.63, P 
= 7 c: 
/•o 
Mar. 9, A = 0.61, P = 7.3; 
Mar. 16, A 
= 0.64, P = 
7.6. 
Begonia ohliqua L. 
Mar. 
9, A 
= 0.33, P 
= 4.0 
Fragaria insular is Rydb. 
Mar. 
9, A 
= 1-15, P 
= 13-9 
Liahum umbellatum (L.) Sch. Bip. 
A 
= 0.71, P 
= 8.5 
Mar. 9, A = 0.69, P = 8.3; 
Mar. 16, A 
= 0.72, P = 
8.7. 
Peperomia stellata (Sw.) A. Dietr. 
Mar. 
9, A 
= 0.45, P 
= 5.4 
Pilea grandifolia (L.) Blume 
A 
= 0.64, P 
= 7.7 
Feb. 9, A = 0.61, P = 7.3; 
Feb. 18, A 
= 0.63, P = 
7.6; Mar. 9, A ■■ 
= 0.67, 
P = 8.1. 
Plantago lanceolata L. 
Feb. 
24, A 
= I.I5, P 
= 13.8 
Seniles Zeugites (L.) Nash 
Mar. 
9, A 
= 0.68, P 
= 8.2 
IV. Windward Ravines and Slopes 
The windward slopes and ravines, exposed as they are to the 
direct influence of the moisture-laden trade winds, exhibit in the 
highest degree the features of climate and vegetation which find their 
simplest expression in the term Rain Forest. The mere statement of 
the rainfall in inches per year conveys no adequate impression of the 
actual environment to which the species constituting this vegetation 
are exposed. The roots of the plants are not merely supplied with 
water by the heavy and well-distributed rainfall, much of which is 
stored for long periods in the litter of the forest floor, but the foliage 
is for much of the time immersed in the floating fog. Thus insolation 
is much reduced. Even at times when rain is not falling and when 
the plants are not enveloped in fog, high atmospheric moisture is 
maintained for long periods of time by evaporation from the litter 
on the ground and from the moist foliage. Here are large trees with 
trunks and branches burdened with thin-leaved, succulent-leaved and 
tank epiphytes, with mats of hepatics and garlands of mosses and 
filmy ferns, shading a nearly bare forest floor or in other places over- 
topping a tangled shrubby and herbaceous undergrowth. Any ade- 
quate description of this forest would not only outrun the space here 
available but in view of Shreve's carefully penned description and 
well chosen and admirably executed plates is quite superfluous. One 
feature plates cannot depict. This is the reeking wetness of the 
foliage. This can only be fully appreciated by one who has had the 
aesthetic pleasure and the physical discomfort of collecting in these 
forests during or immediately subsequent to the gentle rains, which drip 
from the glossy foliage, percolate through th6 sponge-like beds of 
