IX, A, 5 



Brown and Mathews: Dipterocarp Forests 



495 



terocarp forest. In fig. 7 for this area we find the curves of 

 growth for classes II and III occupying the position which we 

 would expect them to do in any virgin forest. During the early 

 stages the grovd;h of all classes is approximately equal. The 

 curve for class III is the lowest, that for class II is the next, and 

 the one for dipterocarps lies above both the others and rises 

 rapidly after the dipterocarps have reached the dominant story. 





Age in years. 

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Fig. 7. Rates of growth of trees. Type area B, Bataan Province, Luzon. 



In fig. 4 for type area A, Bataan, where owing to cutting 

 the trees of class II are more prominent than in the virgin 

 forest, we find this class developing at a more rapid rate than 

 the dipterocarps, while tree class III is but slightly inferior to 

 the dipterocarps in rate of growth. In fig. 5 for the trail trees, 

 where there has been excessive cutting, we again find class II 

 making a more rapid rate of growth than do the dipterocarps, 

 while class III is still below both of the other classes. 



