100 MANGROVE SWAMPS 
TABLE XI.—Stand of firewood 5 centimeters and over in diameter, between 
Barrio Pena and Carayman or Bongon River, Samar. Valuation 
survey taken on 1 hectare. Applicable to 300 hectares. 
[Data from report by Forester Rafael Medina. ] 

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Per cent 
| of each Average | 
Species, ai | Trees. Logs. | See | Volume. 
number | per tree. 
of trees. | 
| cu. Mm. Cords. 
BAKADA See ee eee 55. 77 | 266 619 | 23 33. 83 13.53 | 
AD ISa it ens ee ea eee 24,74 118 195 1.6 11.96 4.78 
Pacdtpatest ee een ee | 9. 22 44 129 2.9 6.76 2.70 
Taipan seen eee ee ee 8.38 40 | 88 222 6.31 2.52 
Bangon-lates< 25 ece ee 1.89 4 18 | 2.0 1.32 0.53 
Titular, 7 A eee ERED. / 100.00 S7)| A049 60.18 | 24.06 
nos a | 
NUMBER OF LOGS BY DIAMETER CLASSES. 
Diameter class in centimeters. 
Species. | | 
10-20. 20-30. 20-40. | 40-50. 
= ed ees ae Bre prt 2 7 
BS UIA A ee se Se en Sit ee ne 198 150 | 96 | 175 
TN CHEE 07 0 ge Aad ae epee ne See es hg a ee Ee Se ee 53 60 26 56 
PAS AGI abies eee on ee ee nee Oe ee eee 39 43 15 | 32 
AW 0) [9 ene oe oe ee A a Se ee ee 15 15 27 31 
Munvon-late ss ee eS oe ee ee 4 2 6 6 
Wiobal ASS wel thet AP ae is bg oe a, 309 270 170 300 | 

CULTIVATION OF RHIZOPHORA (BAKAUAN) 
Cultivated swamps are found in the whole region around 
the upper part of Manila Bay, from Malabon on the east to 
Balanga on the west side; here, the virgin mangle has long 
since disappeared. The extent of the area covered by this 
cultivation has not been determined; but, in places, it extends 
20 or more kilometers inland from the bay. Extensive reports 
on the cultivation of bakauan (Rhizophora spp.) in the above 
region have been made by Dr. F. W. Foxworthy and Ranger 
De Mesa. The following information is taken from their 
reports: 
Nipa and bakauan are planted extensively in solid stands, 
but there is little planting of other swamp species. 
Hundreds, and may be thousands, of hectares are planted to 
bakauan, which is grown for firewood, and sold principally in 
the Manila market, this wood being preferred to almost all 
others for fuel. The Manila supply is inadequate, as is indicated 
by the remarkably complete utilization of the swamps in the 
vicinity, and by the use of other and inferior species. 
