278 
J. ARTHUR HARRIS AND JOHN V. LAWRENCE 
Yucca aloifolia L. A = 1.63, P = 16.3 
Feb. 6, A = 1.78, P = 21.4; Feb. 28, A = 1.45, P = 7.4; Mar. 6, A = 1.66, 
P = 20.0. 
The values given are those for the fully matured leaves. A determination 
from the yellowish leaves which were past their period of maximum physio- 
logical activity was taken on Feb. 6 and gave: A = 1.55, P = 18.7. In the 
collection of Feb. 28 the young leaves gave A = 0.79, P = 9.5. Juice extracted 
from the axis of the plants from which the collection of Feb. 6 was made gave 
A = 0.96, P -- 11.6. 
Herbaceous Plants 
Ambrosia peruviana Willd. Feb. 28, A = 1.02, P = 12.2 
Aristea compressa Buch. Feb. 5, A = 0.72, P = 8.7 
Begonia obliqua L. A = 0.36, P = 4.3 
Feb. 8, A = 0.35, P =4.2; Feb. 14, A = 0.36, P = 4.3; Feb. 28, A = 0.30, 
P = 3.7; Mar. 6, A = 0.41, P = 5.0. 
Bidens pilosa L. Feb. 7, A = 0.74, P = 8.9 
Bryophyllum pinnatum (Lam.) Kurz. A = 0.40, P = 4.7 
Feb. 5, A = 0.38, P = 4.5; Mar. 6, A = 0.41, P = 4.9. 
Cionosicys pomiformis (Macf.) Griseb. Mar. 18, A = 1.06, P = 12.8 
Daucus Carota L. A = 1.16, P = 14.0 
Feb. 5, A = i.oi, P = 12. i; Mar. 6, A = 1.31, P = I5.8._ _ 
Epidendrum verrucosum Sw. A = 0.55, P = 6.6 
Feb. 6, A = 0.58, P = 7.0; Mar. 6, A = 0.55, P = 6.6; Mar. 16, A = 0.51, 
P = 6.2. 
Hedychium flavum Roxb. X Hedychium Gardnerianum Rose. (?) 
Feb. 6, A = 0.67, P = 8.1 
Lycopodium clavatum L. A = 0.79, P = 9.5 
Feb. 18, A = 0.80, P = 9.6; Feb. 24, A = 0.78, P - 9.4._ _ 
Lycopodium Fawcettii Lloyd & Underw. A = 0.89, P = 10.6 
Feb. 18, A = 0.87, P - 10.4; Feb. 24, A = 0.90, P = 10.8^. _ 
Maurandia eruhescens (Zucc.) A. Gray. A = 0.84, P = 10. i 
Feb. 5, A = 0.86, P = 10.3; Feb. 14, A = 0.80, P = 9.7; Feb. 28, A = 0.89, 
P = 10.7; Mar. 6, A = 0.79, P = 9.5. 
Meibornia uncinata (Jacq.) Kuntze (?) Feb. 8, A = 0.62, P = 7.5 
Pastinaca sativa L. A = 1.27, P = 15.3 
Feb. 14, A = 1.35, P = 16.3; Mar. 6, A = 1.18, P = 14.2. 
Pilea grandifolia (L.) Blume (?) Feb. 28, A = 0.66, P = 8.0 
Plantago lanceolata L. A = i.i2,P = i3.5 
Feb. 8, A = 0.95, P = II. 5; Feb. 28, A = 1.13, P = 13.6; Mar. 6, A = 1.29, 
P = I5-5. 
Verbena bonariensis L. Feb. 8, A = 0.94, P = 11.3 
II. The Leeward Ravines 
The ravines, like the slopes, of the leeward side of the mountains 
receive a lighter rainfall, much less fog, and reciprocally more hours 
of sunshine, than the windward habitats. 
