706 
WHITFORD. 
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 that 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 ecological 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 Lamao Forest Reserve, Bryant 3 made 
valuation surveys on the Lamao River basin, in Bataan Province. In 
general, his figures show the predominance of the dipterocarps 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 Dipterocarpaceae reaches a fine development and 
constitutes the bulk of the merchantable timber.” 4 
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 : 
3 Preliminary report on working plan of Bataan Province. Beport of the 
Bureau of Forestry of the Philippine Islands, from July 1, 1901 to September 
2, 1902, from the Report of the Philippine Commission, pp. 483-500. 
4 Loc. cit. p. 484. 
