CONTENTS 



Xlll 



Section 52. Buds and branches 



A. Kinds of buds 



B. Overproduction of buds 

 Section 53. Accumulation in stems 



A. Why not " storage " ? 



B. Substances accumulated 



C. Latex .... 

 Section 53 A. Forestry 



A. Importance of forests 



B. Aims of forestry 



C. Forestry outside of forests 



S CHAPTER SIX: LEAVES 



Section 54. Introductory 



A. Use and beauty of leaves 



B. Points already noted 

 Section 55. External characteristics . 



A. Venation 



B. Shape ... 



C. Attachment and arrangement 



D. Leaf surfaces 



E. Leaf size and foliage area 

 Section 56. Functions ... 



A. Transpiration 



B. General relation of water to the plant 



C. Respiration 

 Z>. Photosynthesis 

 £. Summary as to gaseous exchanges 



Section 57. Structure 



A. Epidermis 



B. Stomates 



C. Mesophyll 



D. Veins 

 Section 58. Protection 



A. The shedding of leaves and their autumnal colors 



B. Movements of leaves 



C. The edgewise position 

 Section 59. Special forms of leaves . 



A. Needle-like leaves . 



B. Leaves as insect traps 



