IX, A, 5 



Brown and Mathews: Dipterocarp Forests 



489 



region might be developed, but the obstacles in the way of such an 

 achievement, at present, seem practically insurmountable. It 

 is probable that for the next few hundred years, at least, 

 foresters working in the Philippines will have to be content in 

 the main with the present composition of dipterocarp forests. 



The next area to be considered is that of type area A which 

 is located just below type area B, Bataan, at elevations of from 



c 



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s 



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a 



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120 



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100 



30 



80 



10. 



60 



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40 



30 



20 



10 



20 



40 



60 



30 



Ase in years. 



/OO 120 I'tO 



ISO 



ZOO 



2Z0 



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A 



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A 





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/ 4 



/^.K 





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Fic. 5. Rates of growth of trail ti-ees. 



approximately 100 to 200 meters. Here the forest has been cut 

 over to a considerable extent, but the openings have been largely 

 closed by a growth of vines, shrubs, and small trees. The rates 

 of growth for this area are given in Table XXIV. The curves 

 of growth compiled from the averages given in Table XXIV 

 appear in fig. 4. The average rate of growth of dipterocarps 

 in this area is only slightly greater than that of dipterocarps 

 on type area B. Thus, the average time required for the dip- 



