ILLUSTRATIONS 
Puate IV 
Relief map of Volcano Island before the eruption of 1911. The only 
changes caused by the last eruption that were of sufficient 
magnitude to show on this relief map are within the crater, the 
center of which is now occupied by a single large lake (Plate 
XVI, fig. 2). (Map prepared in the division of mines, Bureau 
of Science.) - 
PLATE V 
Fic. 1. Photograph taken in December, 1909, to show erosion on the south- 
western slopes of Taal Volcano. On the right is Taal Volcano, 
while Mount Tabaro is on the left. The center of the picture 
is occupied by the prominent dry stream bed extending south- 
west toward Mount Saluyan. In the foreground is a small ridge 
with scattered clumps of grass. The dry stream bed contains a 
few trees and very widely spaced clumps of grass. The slopes 
are apparently bare, but may have supported scattered tufts of 
grass. : . 
2. View of the southeastern slopes of . Volcano Island from Lake 
Bombon, April, 1908. The steep slopes of the main cone appear 
to be very bare, while the lower and more level ground is covered 
/ with vegetation in which trees predominate. 
PLATE VI 
Fic. 1. View of the southeastern shore of Volcano Island and Taal Volcano 
during the period of activity in 1911 and the day before the great 
eruption that destroyed the vegetation. Near the lake the vegeta- 
tion consists largely of grass, while trees are more prominent 
farther inland. 
2. The northern slopes of Mount Binintiang Malaqui at the north- 
western point of Volcano Island, December, 1909. The cone is 
covered with vegetation in which trees are very prominent. 
PLATE VII 
Fic. 1. The effect of the mud blast on a tree at Gulod, on the mainland, 
about 8 kilometers from the crater. Natural size. (Photograph 
by Martin.) 
2. A tree 15 centimeters in diameter broken by the force of the 
eruption and the bark and wood shreded by the mud driven by 
the force of the eruption. ( Photograph by Martin.) 
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