712 
WHITFOED. 
The figures show the percentage of bulk of the dipterocarps in the 
two types to be respectively 53.7 per cent and 66 per cent, a percentage 
that is much higher than that of the stand, indicating that the volume 
of these trees averages higher than that of the other species. 
FORESTS IN' NORTHERN NEGROS. 
On the lower slopes of Mount Silay, Negros, is a large body of timber. 
In cooperation with H. D. Everett, this region was investigated. 
The work was done on a lumber concession containing about 16,000 
hectares of solid dipterocarp forest. The tract lies on the lower slopes 
of Mount Silay just back of the coastal strip of cultivated sugar lands, 
here about 10 kilometers wide. It is situated on both sides of the Himu- 
gaan River. The land is characterized by gentle slopes, with alternating 
ridges; the elevation ranges from 30 to 370 meters. Small streams and 
arroyos are scattered profusely over the tract. 7 
The methods used in estimating the stand and determining the com- 
position of the forest were identical with those in Mindoro. 
Tables X and XI show the stand and volume of the forest. 
Table X . — Stand of trees 1/0 centimenters and over in diameter in northern Negros 
( average of 5^.65 hectares). 
Scientific name. 
Common name. 
N umber 
of trees 
per 
hectare. 
Per cent. 
Dipteroc.arpaceae: 
Dipterocarpus qrandiflorus Blanco 
Shorea furfur acea Miq. ? . __ 
Shorea polysperma Merr. _ 
A pi tons' 
Almon lauan _ . 
Tangible _ 
Red lauan 
19. 158 
16. 178 
11.32 
20. 851 
| 5. 114 
72. 624 
8. 626 
23.6 
19.9 
13.9 
25.7 
6.3 
89.4 
10.6 
Pentacme contorta Merr. & Rolfe 
White lauan _ 
Bagtican laua.n_^_ 
All others _ _ __ _ _ _ 
81. 250 
100 
The significance of these figures, showing a dipterocarp stand of 72.624 
trees per hectare out of a total of 81.250 and a percentage of 89.4 needs no 
comment. 
Diospyros mindanaensis Merr. ( Ebenaceae ) and Vitex aherniana 
7 Everett, II. D. and Whitford, H. N. A Preliminary Working Plan for the 
Public Forest Tract of the Insular Lumber Company, Negros Occidental. P. I. 
Bureau of Forestry (Philip.) Bull. 5 (1906) 1-54. 
