CONTENTS. 



CHAPTER V. 



Beauty of Leaves Variety of Forms Causes of Variety Size of 

 Leaves Hornbeam, Beech, Elm, Sycamore, Lime, Chestnut, 

 Mountain Ash, Elder, Ash, Walnut, Ailanthus, Horse Chestnut 

 Rowan Forms of Leaves Lime Beech Nut Spanish Chestnut 

 Elm Conifers Yew Length of Leaves in Conifers Horse 

 Chestnut Maple Structure of Leaf Stomata Poplars Black 

 and White Poplar Plants with Vertical Leaves Lettuce 

 Compass Plants Pages yj 118 



CHAPTER VI. 



Tropical Vegetation Australian Acacias Acacia Melanoxylon with 

 two types of Leaves Eucalyptus Juniperus Sinensis Ivy Fall 

 of the Leaf Length and Longevity of Coniferous Leaves Ever- 

 green Leaves Functions of Hairs Hairs as a Protection Rela- 

 tion of Hairs and Honey Water-Plants often Glabrous Mimicry 

 Mayweed and Chamomile Stinging-nettle and Dead-nettle 

 Yellow Bugle Form of Leaves in Water Plants Floating and 

 Submerged Leaves Plants with two forms of Leaves Ranunculus 

 aquatilis Much Divided Leaves frequent in Herbaceous Plants 

 Entire Leaves frequent in Shrubs and Trees Broad and Narrow 

 Leaves Attitude of Leaves Drosera and Plantago Daphne 

 Vegetation of Dry Regions Succulent Plants Various Forms 

 of Leaf in Lathyrus Lathyrus Aphaca and Nissolia Lobed and 

 Heart-shaped Leaves Possible Modes of accounting for the 

 Difference Leaves of Seedlings Lobed Leaves often preceded 

 by Heart-shaped ones Cephalandra Hibiscus Passiflora Ex- 

 planation of Forms of Leaves Form of Leaf has Relation to 

 Requirements of Plant Senecio Herbaceous Species Shrubby 

 Species Climbing Species Succulent Species Tree Species 

 Great variety of Forms Conclusion Pages 119 147 



