30 SYLVICULTURE IN THE TROPICS 



FT. I 



some give valuable by-products, such as gutta-percha 

 (Isonandra and Palaquium), gum-resin (Canarium), 

 gamboge (Garcinia), jaggery or sugar and toddy (Car- 

 yota), rattan (Calamus), and edible fruit (Garcinia). 



FlG. 8. Buttressed tree of the wet zone. Telrameles nudiflora. 



I have described above only what may be called the 

 virgin-forests; there are also numerous forms of secondary 

 growths caused by other factors, which will be described 

 later. 



