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 g"] — Ii8 



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 m 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 iii) — 147 



