CONTENTS. 



Page 



Natural conditions relating to forest growth 7 



Geographic situation 7 



Cou figuration 8 



The mountains , 8 



The pepino hills 9 



The streams 10 



The coast-horder region 11 



The hills 11 



The play a plains 12 



The parting valleys 13 



Minor and exceptional features of configuration 14 



Geologic formations and soils 14 



Geology 14 



Soils 15 



Ruinate lands 17 



Climate 18 



The relations of agriculture and the forest 18 



Forest aspects of the island 19 



Wooded character of the island 20 



The various flora 20 



The mountain flora „ 21 



The mountain woodlands 21 



The forest of El Yunque 22 



The coast-horder woodlands 24 



Forest and other tree products 25 



Trees used by man 25 



Exogenous woods used in construction and other industries 26 



Characteristics of fifteen Porto Rican woods 26 



General description 26 



Description in detail 27 



Endogenous trees used for various purposes 30 



Trees valuable for various products 32 



Resinous and oleaginous trees 32 



Trees valuable for fruits 35 



Poisonous trees and plants ., 38 



Value and uses of timber 39 



Construction 39 



Fuel 40 



Manufactured products 41 



Imports and exports of timber 41 



Lumbering 44 



Problems of reforestation „ 45 



Botanical names of species 47 



3 



