711 



WHITFORD. 



'J 1 he following shows its character : 



TABLE XII. — Stand of trees 30 centimeters and over in diameter on the, lower 

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



Scientific Dame. 



Common name. 



Average 

 number 



of trees 



per 

 hectare, 



Per 



cent. 



56.88 



. *2 



14.88 



•"). 02 



1 02 

 .8 



1.8 



l.l 



Diptbbocabpaceab: 



Bagtican lauan... 

 Guijo.. .. . . 



Took - 



Magalipac 



Dim 



■17. fi 



12 

 (.2 



1.7 



L.8 





Combbbtaobae: 



Stei:( ti.iai'k a k: 

 StercuHa Uemeoi Rolfe . ..- - 



An ai IABDIAOBA1 : 



DracontomHum iln<> Merr. & Rolfe 



Koordertiodendronpinnatum Merr, ... 



Leci minosak: 



Niirru _. _ 



Tamayuan 



OliAOAOKAB: 





U.. r . 17.4 



'I'olill 





83.5 ! 100 











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 foresi in this region is reserved for another paper. 



FORESTS OF THE ZAMBOANGA PENINSULA IN MINDANAO. 



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

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



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

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

 356 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 XIII and XIV show the stand and volume on two types. 



