516 



The Philippine Journal of Science 



Along with the three curves of Shorea rohusta in different 

 situations, we have also presented a curve for Parashorea plicata 

 on Mount Maquiling and one for Shorea polysperma on type 

 area B, Bataan. The curve for Parashorea plicata shows a 

 somewhat faster rate of growiih than do any of those for 





Age in years. 

 ZO ^ 60 SO 100 IZO t'tO 160 180 ZOO 2Z0 Z4C 



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Fig. 11. Kates of growth of Shorea robusta compared with those of Philippine dipterocariw. 



Shorea rohusta, while the curve for Shorea polysperma shows 

 a rate of growth not very different from the two curves 

 for Shorea rohv^ta drawn from data collected at elevations of 

 300 and 900 meters. It may be judged from this that the rates 

 of growth of the dipterocarps in the Philippines are comparable 

 with those of Shorea rohusta in India. 



(To be concluded.) 



