STUDIES IX THE VEGETATION OF THE PHILIPPINES, I. 713 



Men*. (Verbenaccae) with a stand of 1.4 and 0.95 trees respectively per 

 hectare are the only two other species of any numerical importance in 

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

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

 Calophyllum sp., (Guttifcrae) , Eugenia spp., (Myrtaceae), Canarium 

 sp., and Santiria nitida Merr., (Burseraceae) , Palaquium spp., (Sapo- 

 taceae), Terminalia spp., (Combretaccae) , Koordersiodendron pinnatum 

 Merr., Dracontomeliim dao Merr. & Kolfe, Mangifera aWssima Blanco, 

 (Anacardiaceae) , Macaranga tanarius Muell.-Arg., (Eupliorbiaceae), Dil- 

 lenia sp., (Dilleniaceae) , Neolitsea sp., (Lawaccae) , and Artocarpus com- 

 munis Forst., (Moraceae) . 



The volume of the dipterocarps is given in the following tahle. 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 JfO centimeters and 

 over in diameter on a tract in northern Negros (average of 54.65 hectares). 



Species. 



Common name. 



Average 



per 

 hectare. 



Dipterocarput grandiflorus Blanco. 



ShortafuTfwaeea Miq. ? 



Shorea polysperma Merr. 



Shorea ep 



Pent acme contorta Merr. & Rolfo .. 

 Parashorea plicata Brandis 



Total 



Apitong 



Almon 



Tanguile 



Kedlanan 



White liuian 



Bagtican lauan 



Cubic 



mi Ins. 



66.63 



92. 02 



59.93 



185.18 



25. 23 



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. 



FORESTS IN AltOROY REGION, 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 about 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. 



