712 



WHITFORI). 



The figures show the percentage of bulk of the dipterocarps in the 

 two types to be respectively 53.7 per cent and 06 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 II. D. Everett, this region was investigated. 



The work was done on a Lumber concession containing about l(i,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 Ilimu- 

 gaan River. The land is characterised by gentle slopes, with alternating 

 ridges; the elevation ranges from ;><> to 370 meters. Small streams and 

 arroyos are scattered profusely oyer 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 40 centimenters and over in diameter in northern Negros 

 (average of SJf.65 hectares). 



Scientific name. 



DllTKKOCA Kl'ACKAK: 



Dipterocarptu gnmdiflonu Blanco 

 Skortafurfwacea Bfiq.T 



Common name. 



Apitong 



Aiinon lanan. 



Number 



of trees 



per 

 hectare. 



Percent 



19. 158 

 16, I7.s 



8horta potfftperma Men- J Tangulle ' 11.32 



Storm sp 



Ptntacme etmtorta Hen. & Rolfe. 

 Parathorea i>lic<ti<i Brtuulis 



Total DtpU rocarpaCi at 

 All others 



Total 



23. f> 

 111. '.1 

 13.9 



Red lanan 



white lanan 



Bagtican lauan 



20.854 



5.114 



72. 624 



s. ti2ti 



89. 4 



10.fi 



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 mindanaends Merr. (Ebenaccae) and Vite.v aherniana 



'Everett, H. D. and Whitford, II. N. A Preliminary Working Plan for the 

 Public Forest Tract of the Insular Lumber Company, Negros Occidental. I\ J. 

 Bureau of Forestry (Philip.) Bull. 5 (1906) 1-54. 



