14 



w III rrctKi). 



Till' following shows its character: 



Table XII. — Stand of trees 30 centimeters and over in diameter on the loicer 

 slope type of the Aroroy region, Masbate {average of 16 acres). 



Seifiitilic niiiiiv. 



Common imiiu'. 



Average 

 number | 

 of trees 



per 

 hectare. 



Per 



cent. 



DlITEROrAltPACEAE: 



Paranhorra plicala Brandis - Bagticau lauan. 



Shorea (iniso Bltime.. — — Guijo 



Combketaceae: 

 Tirminalia t/nadnalnta Merr. - Toog 



Steiuuliaceae: 

 Stercnlia blimroi Rolfe — Magalipne . 



Anacardia'ceae: 



Dracontomelum dan Merr. & Rolfe — j Dao 



Koorderdodcndronpinnatum Merr j Amiiguis — 



Legi minosae: 

 PterorarpxixindicusyKWM. ^ Narra 



Olacaceae: 

 Slromboaid pliilipiiiiioigi!' Kolfe 



All others 



Total . 



•17.5 .i6.88 



.7 .82 



12 U.Sli 



4.2 I 5.02 



1.7 



.0 1 1.1 

 14.5 j 17.4 I 



It is thus to be noted that 47 trees out of 83, or approximately 57 per 

 cent of the stand, belong to two species of the dipterocarps. A discussion 

 of the other types of forest in this region is reserved for another paper. 



FORESTS OF THE ZAMBOANGA I'ENINSULA IN MINDANAO. 



In cooperation with W, I. Hutchinson, the forests of a lumber con- 

 cession located at Port Banga at the head of Zaniboanga Peninsula on 

 the Island of Mindanao were investigated. The work here was similar 

 to that accomplished in Mindoro and Negros. This tract, comprising 

 355 square kilometers, has about 52 per cent (or 186 square kilometers) in 

 virgin forest. Of this, 16,144 hectares or 86.37 per cent is forest in which 

 the dipterocarps predominate. 



The topography of the region is rough and broken. It is composed 

 mostly of low irregular ridges 15 to 100 meters in height extending into 

 headlands bordering on the sea. These lead inward to the base of the 

 mountains. The rivers are small and beyond tidal limits are hill streams 

 with canon-like valleys whose beds are full of bowlders and rock outcrops. 

 Tables XIIT and XIV show the stand and volume on two types. 



