44 WARPEN D. SMITH 
Ta his study of the Southwestern Luzon 
regin, Adams has discussed the two first- 
nam :d bodies.* 
}aguna de Bay is a heart-shaped body 
of w ter with two prongs of land projecting 
into t from the northside. It lies a short 
distance southeast of Manila, and is sepa- 
rated from Manila Bay by about 6 miles 
of land. Its dimensions are 25 by 28 miles. 
It is fairly shallow. The height above sea- 
level varies between 0.9 and 4.3 feet. 
Taal Lake.—The second largest lake in 
Luzon is Taal Lake or Laguna de Bombon 
(Fig. 3). This has generally been regarded 
as a crater lake by such writers as von 
Drasche and Becker, but Adams who has 
perhaps given more time and study to it 
than any other, attributes the origin of 
the lake to peripheral faulting. My own 
opinion is that the lake has originated 
through (1) peripheral faulting, (2) explo- 
sion of a former and much larger volcano 
than now exists there, and (3) subsequent 
collapse of the crater area (Fig. 4). 
For details about this Jake and volcano, 
I shall merely refer the reader to the three 
most exhaustive articles on this subject.? 
Fic. 3.—Taal Lake; Taal Volcano on low island in right background 
THE HUMAN RESPONSE TO PHYSIOGRAPHIC 
CONDITIONS 
The relationship between man’s work 
and physiography, has long been empha- 
sized by many writers. Although this rela- 
tionship has often been over-estimated, 
1G. I. Adams, “Geologic Reconnaissance of Southwestern Luzon,” Philippine 
Journal of Science, V, No. 2. 
2G. I. Adams, of. cit.; W. E. Pratt, “Eruption of Taal Volcano,” Philippine 
Journal of Science, VI, No. 2; D. C. Worcester, in National Geographic Magazine, 
IgI2. 
