494 



The Philippine Journal of Science 



1914 



canopy, and thereby lessen the total amount of commercial wood 

 produced. It is to be expected that during their early stages they 

 will show rates of growth approximately equal to those of the 

 dipterocarps, but as they increase in diameter without becoming 

 dominant their rates of growth will become slower than those 

 of the dipterocarps, and the growth of class III will be even 

 slower than that of class II. Measurements of rates of gi'owth 

 of these classes were taken in all of the areas in Bataan; also, 

 in the Maquiling forest. The results are given in Tables XXVII 

 to XXXVIII, and growth curves for each area are plotted in 

 figs. 4, 5, 7, and 8, along with the average growth curve for dip- 

 terocarps in the same areas. 



The largest number of measurements were taken on type area 

 B, Bataan, which, as mentioned above, represents a good dip- 



Table XXVI. — Annual diameter growth of trees of Class I. Dipt&rocarps. 

 Type area C. Bataan Province, Luzon. 



[Diameter and growth are given in centimeters.] 



Species. 



Diameter class in centimeters. 



10 to 20. 



20 to 30. 



30 to 40 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



^opea acitmtnato (dalindingan) . - 



17.2 

 16.9 



0.073 

 0.000 



28.6 

 26.1 

 21.0 



0.240 

 0.153 

 0.094 



36.8 

 36.8 

 39.4 



0.094 

 0.276 

 0.164 



Do... 



Do.- . . . 









PentCyCme contorta (white lauan) 











30.6 



0.035 









22.3 



0.265 



Ayii&opt^^a ihurifera (palosapis) 







31.2 



0.329 



Total ... . 













0.073 

 0.036 





0.752 

 0.188 





0.898 

 0.179 



Average ... 





Ypflr« in cJaKp 



2 



74 



63.2 



65.9 





' 



Species. 



Diameter class in centimeters. 





60 to 70. 



70 to 80. 



100 



to 110. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 

















Do 















Do . -. . . 











1 



Shorea polyaperma (tangruile) 







76.8 



0.134 



107.0 



1.23 



Pentacifie contorta (white lauan) 



63.6 



0.412 



























Total 









1 





0.412 

 0.412 

 t.3 



j 0.134 



.i 0.134 



74.fi 



-_ 1.23 



! 1.2S 



81.3 



Average.. .. 





Years in class .. . . _ 



2 











1 



