ILLUSTRATIONS 
Plate 1 
Map of the Philippine Islands, showing the commercial forests (green) 
and the division of the Archipelago into zodgeographic sub- 
provinces (red). 
Plate 2 
Fig. 1. Bancoran Island, in Sulu Sea, as seen at low tide. The trees belong 
to a species of Pisonia. (Photograph by Cortes.) 
2. Bancoran Island, Sulu Sea, at high tide. (Photograph by Cortes.) 
3. Maeander Reef, Sulu Sea. (Photograph by Cortes.) 
' Plate 3 
Fig. 1. Hundreds of brown boobies, Sula leucogastra (Boddaert), on Usong 
Island, Tubbataha Reef, Sulu Sea. (Photograph by Worcester 
and Cortes.) 
2. A colony of sooty terns. Sterna fuscata Linnaeus, with young, on 
Maeander Reef, Sulu Sea. There are a few brown boobies in 
this colony. (Photograph by Worcester and Cortes.) 
Plate 4 
Brown and white boobies on Usong Island, Tubbataha Reef, Sulu Sea. 
(Photograph by Worcester and Cortes.) 
Plate 5 
Fig. 1. Monument marking the boundary Between Rizal and Bulacan Prov- 
inces, Luzon, erected in 1858; kilometer 13, Manila-North Road. 
(Half-tone etching loaned by the Bureau of Public Works.) 
2. Typical roadside vegetation in Bulacan Province, Luzon; kilometer 
23, Manila-North Road. (Half-tone etching loaned by the Bu- 
reau of Public Works.) 
Plate 6 
Fig. 1. A typical road in Tayabas Province, Luzon, on the Manila-South 
Road. In a coconut region. (Half-tone etching loaned by the 
Bureau of Public Works.) 
2. Typical cultivated vegetation in Cavite Province, Luzon. (Half- 
tone etching loaned by the Bureau of Public Works.) 
Plate 7 
Fig. 1. A flight of locusts near Pasay, Luzon. (Photograph by Cortes.) 
2. A clump of bamboo near Pasay, partly defoliated by locusts. (Pho- 
tograph by Cortes.) 
433 
