478 



The Philippine Journal of Science 



1914 



that the species of northern Laguna grow much more slowly 

 than does Parashorea plicata on Mount Maquiling. Thus, it 

 takes Shorea teysmanniana, the most rapidly growing of all the 

 northern Laguna species, one hundred two years to grow from 5 

 centimeters to 50 centimeters in diameter, while Parashorea 

 makes the same growth in eighty-three years. Dipterocarpus 



Table XVIII. — Annual diameter growth of Shorea squamata (mayapis) . 

 Northern Laguna forest, Laguna Province, Luzon. 



[Diameter and growth are given in centimeters.] 



No. of tree in class. 



Diameter class in centimeters. 



OtolO. 



10 to 20. 



20 to 30. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



1 



7.6 

 9.1 

 7.5 



0.345 

 0.198 

 0.559 



18.2 

 10.8 

 16.1 

 14.9 

 10.2 



0.768 

 0.362 

 0.148 

 0.773 

 0.542 



22.3 

 21.5 

 26.1 

 26.6 

 22.8 

 28.9 

 20.1 

 29.9 

 20.3 

 28.8 

 26.2 

 23.8 

 21.4 



0.461 

 0.207 

 0.329 

 0.625 

 0.722 1 

 0.806 ; 

 0.280 1 

 0.099 

 0.231 

 0.116 

 0.329 

 0.099 

 0.296 

 .1 



2.. . — -. 



8. 



4... 



7.5 0.345 

 6. 1 0. 905 



5 . 



6 



8.9 

 9.6 

 9.9 

 8.4 

 7.7 

 7.4 

 7.5 



0.346 

 0.115 

 0.148 

 0.197 

 0.296 

 0.066 

 0.263 



15.4 ! 0.493 



10.6 0.082 

 19.0 0.214 

 12. 8 0. 247 



12.7 ' 0.148 

 14.4 0.033 

 17. 4 0. 164 

 13.3 0.148 



7 



8 



9.. 





10.. 

 U— 







12 



13 



14-. 







11.6 

 13.0 

 17.0 

 16.4 



0.263 

 0.411 

 0.477 

 0.230 



16 . . 1 _ ... .. 









16. . 











17 











Yea 



Total.. 



1 









3.783 

 0.316 





4.768 

 0.280 





4.599 

 0.354 











rs in class . ,. ._ 



31 



.6 



3F 



.7 



2£ 



2 







1 



No. of tree in class. 



Diameter class in centim 



sters. 



30 to 40. 



40 to 50. 



50 to 60. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



Diam- 

 eter. 



Growth. 



1.. 





34.7 

 31.7 

 37.9 

 89.2 

 37.5 

 35.4 

 35.2 



0.263 

 0.575 

 0.000 

 0.346 

 0.181 

 0.016 

 0.560 



40.5 

 48.0 

 41.3 



0.625 

 0.181 

 0.460 



57.0 



0.263 



2 



S 







4.. 



6.. 

















6.. 









7.. 









8 









9 _ 













