718 
WIIITFORD. 
SUMMARY OF STAND AND VOLUME. 
The following is a summary of the stand and volume tables given in 
this paper. 
Locality. 
Per cent of Dipter- 
ocarpaceae by — 
Stand. 
Volume. 
Bataan Province, Luzon: 
Limay _ _ _ _ __ 
CO. 9 
68. 80 
Mindoro: 
Narratvpe _ _ 
33.11 
53. 70 
Hagachae type 
41. 50 
66. 00 
Negros _ „ _ 
89.4 
95.00 
Zamboanga, Mindanao: 
Yacaltvpe _ 
43.7 
47.00 
Lauan type _ _ ________ _ 
45.86 
46.3 
a 80 
Levte . _ 
“80 
Masbate _ _ _ 
4V. 5 
“ Estimated. 
It will be seen from the above that from 33 per cent to 89 per cent 
of the stand and 46 per cent to 95 per cent of the volume of these forests 
are composed of species of the Dipterocarpaceae. It is estimated that at 
least 75 per cent of the present virgin forest area comprising some 40,000 
square miles is of like nature. Such a forest has been found in practically 
all classes of habitats from sea level to an altitude of approximately 900 
meters on the largest mountain masses. Within these forests, to be sure, 
there are local conditions such as character of soil, steepness of slope, 
exposure to severe atmospheric conditions, and those due to artificial 
interference, that do not favor clipterocarps at the present time. However, 
the vegetation in many of these situations is only transitory in nature 
and may be considered as stages in succession toward some form of the 
most successful forest, viz, the dipterocarp forests. As mentioned here- 
tofore it is not the intention to discuss in this paper the different types, 
nor the different stages of succession. Briefly it can be stated that a 
representative of a climax forest is found in Negros where the bulk reaches 
about 429 cubic meters per hectare of wood. Here it is believed that a 
combination of edaphic, climatic, and biotic factors have reached the 
optimum necessary to the establishment of most successful growth in 
the Philippines. The climate is uniform as regards temperature, and 
with the exception of a short dry season interspersed with showers it 
is fairly uniform as regards humidity and rainfall. The topography is 
composed of gentle slopes so that the soil wash is not great nor in the 
rainy season is there an accumulation of excessive moisture in the soil. 
It is probable that originally a greater part of the area of the Philippines 
