7U6 winTF(»iu>. 



appeal to me as my studies had not been extensive enough to reach 

 certain conclusions that have since become apparent. 



The figures given above, showing tluit about 50 per cent of the actual 

 number of trees over 4 meters in height on one hectare are members of 

 one family, are significant not only from an t'c<)logi(al standpoint but 

 from a lumberman's standpoint. 



Since they were compiled, various parts of the Islands have been studied 

 in detail and still larger areas have been visited so that the conclusions 

 reached herein have solid foundations. The work of other men cooperat- 

 ing with me shows similar results. 



Previous to my work on the Lanuio Forest lieserve, Bryant '' made 

 valuation surveys on the Lamao River basin, in Bataau Province. In 

 general, his figures show the predominance of the dipterocai-ps both in 

 stand and bulk. His statement concerning this family is as follows: 



"In the region south of a line drawn from Bagac on the west coast to 

 Lamao to the east coast, an area of approximately 65,900 acres, * * * 

 a detailed examination was made of the forest. In this part of the 

 province the family of the Diptcrocarpaccae reaches a fine development and 

 constitutes the bulk of the merchantable timber." * 



Unfortunately for the purposes of this paper all trees of a merchantable 

 size were not considered by Bryant so the exact proportion of dipterocarps 

 to all others can not be given. 



A recent estimate of the stand and volume of all timber over 40 centi- 

 meters in diameter was made on a tract of land covering approximately 

 50 hectares near Limay, Bataan Province. This tract is immediately 

 adjacent to that covered by Bryant. All trees on this tract above 40 

 centimeters were counted and the volume was obtained by the sample tree 

 method. The altitudinal range is from 170 to 425 meters. The follow- 

 ing shows the stand in this forest: 



'Preliminary report on wmkiny plan of Bataan Province. Report of the 

 Bureau of Forestry of tlie Pliiiippine Islands, from July 1, 1901 to September 

 2, 1902, from the Report of the Pliilii)i)ine Conimission. ])p. 483-500. 



* Loc. cit. p. 484. 



