CONTENTS. 



Page. 



CHAPTER I. THE LIFE OF A TREE 7 



The parts of a tree 8 



The food of a tree 11 



The composition of wood 14 



How the tree breathes 15 



Transpiration 16 



The growth of a tree 18 



The structure of wood 19 



Annual rings 22 



Heartwood and sapwood 23 



CHAPTER II. TREES IN THE FOREST 25 



The various requirements of trees 25 



Requirements of trees for heat and moisture 26 



Requirements of trees for light 30 



Tolerance and intolerance 32 



The rate of growth 36 



The reproductive power of trees 37 



The succession of forest trees 39 



Pure and mixed forest 39 



Reproduction by sprouts 42 



CHAPTER III. THE LIFE OF A FOREST 44 



A community of trees 44 



The life of a forest crop 46 



The seven ages of a tree 47 



How the crop begins 49 



The forest cover established 51 



The beginning of the struggle 52 



Growth in height 54 



The struggle continued 56 



Natural pruning 58 



5 



