EXPLANATION OF THE PLATES 
(Photographs by Gates) 
PLATE XI 
Diagram of the successions in the Los Bajos area.* 
PLATE XII 
Diagram of the successions in the Tarlac area.* 
PLATE XIII 
Fic. 1. Looking northwestward at the Los Banos hot springs, Bacopa-Lippia 
and Fimbristylis spathacea associations nearest the hot water. 
Farther away are Acrostichum and Acacia farnesiana Willd. In 
the extreme foreground is Typha in a ditch along the railroad. 
December 16, 1912. 
2. From the railroad, looking northward at the Los Bafos hot spring 
near the close of the dry season. An upright stick marks one 
of the hot water vents, near to which runners of Bacopa approach. 
Fimbristylis spathacea Roth at the right marks the normal bound- 
ary of the pool of hot water. Acrostichum and Acacia farnesiana 
Willd. are in the background. May 24, 1913. 
3. The edge of a flat in the Los Banos area. In the foreground is 
Bacopa monniera Wettst. in flower; in the background is the fern, 
Acrostichum aureum L., and Acacia farnesiana Willd. Between 
Acrostichum and Bacopa are plants of Lippia nodiflora Gaertn. 
May 24, 1913. 
PLATE (AL V 
Fic. 1. From the railroad looking over the eastern part of the Tarlac area. 
Phragmites vulgaris Trin. is in flower. March 9, 1913. 
2. From the railroad looking over the western part of the Tarlac 
swamp area. Mount Maquiling is in the background and a hot 
spring at the extreme right in the foreground. March 9, 1913. 
3. A hot spring in the western part of the Tarlac area when the high 
water had partly receded. The bushes of Gliricidia sepium Steud. 
on the extreme left were killed by the high hot water. Between 
them and the hot water Panicum repens L. is reinvading. Dead 
bushes of Sesbania cannabina Pers. are standing in hot water. 
November 25, 1914. 
*In Plates XI and XII for Bottom algae assoc. read Bottom thermal 
assoc.; for Surface algae assoc. read Surface thermal assoc. 
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