STU1)IP:S IX THE VI'XJETATIOX OF THE PHILIPPINES, I. 713 



Merr. {Verbenacciw) with a stand of 1.4 and 0.95 trees respectively per 

 hectare are tlie (jnly two other species of any numerical importance in 

 this forest, though the following species occur very scattered: Hopea 

 phiUppinensis Dyer and Hopea acuminata Merr., (Dipterocarpaceae), 

 CalophyUum sp.. {Gutfiferae), Eugenia spp., {Myrtaceae) . Canarium 

 sp., and Santiria nitida Men:, {Burseraceae), Palaquium spp., {Sapo- 

 taceae), Terminalia spp., {Comhretaceae), Koordersiodendron pinnatum 

 Merr., Dracontomelum dao Alerr. & Rolfe, Mangifera altissima Blanco, 

 (Anacardiaceae) , Macaranga tanarius Muell.-Arg., (Euphoi-hiaceae) , Dil- 

 lenia sp., (DiUeniaceae), Neolitsea sp.. {Latiracrae), and Artorarpus com- 

 munis Forst., (Moraceae) . 



The volume of the dipterocarps is given in the following table. The 

 minor species are not included in this estimate because of their small 

 numbers and comparative unimportance. 



Table XI. — Volume per hectare of the six principal species ^0 centimeters and 

 over in diameter on a tract in tiorthern Segros (average of 5.^.65 hectares). 



Species. 



Common name. 



Average 



per 

 hectare. 



Dipterocarpiis grandifloni^ Blanco- 



Shoreafur/uracca Miq. ? 



Shorea poly^perma Merr 



Shorea sp 



Pentacme contorta Merr. & Rolfe — 



Parahhorea pUcata Brandis 



Total 



Cubic 

 meters. 



Apitong 66.63 



Almon 92.02 



Tanguile ; 59.93 



Redlaiian 185.18 



White lauan 



Bagtiean lauan. 



25.23 



428. 



While the figures of the stand show 89.4 per cent of dipterocarps it 

 is estimated that the six species given above comprise more than 95 

 per cent of the total bulk of the forest. 



FOKESTS IN AROROY REGIOX. MASBATE. 



On a detail to investigate the forest resources of the Aroroy mining 

 region in Masbate rough estimates of stand were made. This study, 

 comprising 200 square kilometers, is more than half in forest. The 

 topography is rough and consists of sharp ranges of hills and higher and 

 more resistant peaks. The hills are al)out 125 to 150 meters in altitude 

 and the highest peak is 362 meters. Approximately 80 per cent of the 

 forested area, distinguished as the lower slope type, is distinctly diptero- 

 carpous in nature. 



