STUDIES IN THE VEGETATION OF THE PHILIPPINES, I. 713 
Merr. ( Verbenaceae ) 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 Ilopea acuminata Merr., ( Dipterocarpaceae ), 
Calophyllum sp., (Gultiferae) , Eugenia spp., ( Myrtaceae ), Ganarium 
sp., and Santiria nitida Merr., (Burseraceae ) , Palaquium spp., ( Sapo - 
taceae), Terminalia spp., (Combretaceae) , Koordersiodendron pinnatum 
Men’., Dracontomelum dao Merr. & Eolfe, Mangifcra aWssima Blanco, 
(Anacardiaceae ) , Macaranga tanarius Muell.-Arg., (Euphorbiaceae ) , Dil- 
lenia sp., (Dilleniaceae) , Neolitsea sp., (Lauraceae) , and Artocarpus 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 40 centimeters and 
over in diameter on a tract in northern Negros ( average of 54-65 hectares ) . 
Species. 
Common name. 
Average 
per 
hectare. 
Vipterocarpus gmndiflorus Blanco _____ _ __ _ 
A pi tong _ 
Cubic 
meters. 
66. 63 
92. 02 
59. 93 
185. 18 j 
| 25.23 
Shorea furfuracca Miq. ? _ 
Almon _ 
Tanguile _ _ 
Shorea sp ____ _ _ 
Redlanan 
P cnt acme c onto rta Merr. & Rolfe _ _ _ 
White lauan 
Bagtican lauan___ 
Total 
428. 99 
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 AROROY 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. 
