xiv CONTENTS 



velvety appearance of flowers' petals, how it is produced — 

 Vascular tissues — Monocotyledons — Dicotj'ledons — Tissue 

 which forms new cells — The rough bark of trees — The age of 

 trees, how it can be estimated — Varieties of stem structure — 

 Stems and leaf-stalks — Structural botany uninteresting 



Pp- 32-57 



CHAPTER III 



A GREEN LEAF 



All life depends upon the activity of a certain green-coloured 

 substance which is found in the tissues of lea\'es — The 

 structure of a laurel leaf — The growing-point of a stem — 

 Variations in leaf structure — Chemical analysis of a green 

 leaf — Great trees chiefly built up of carbon obtained from 

 the atmosphere by green leaves — " Fall " of leaves — Plants 

 and animals dependent on each other — How leaves purify 

 the air — Chlorophyll corpuscles — Plants not only supply us 

 with oxj'gen, but all our food and innumerable home com- 

 forts — Canadian woodland and forest — Chlorophvll the 

 mainstay of life — Enormous quantities of carbon dioxide 

 passed into the atmosphere daily . . . Pp. 58-83 



CHAPTER IV 



POLLEN, OR FLOWER-DUST 



Sex exists as much amongst plants as animals — Male and female 

 flowers of a begonia — Functions of coloured portions of 

 flowers — Stamens from various flowers — Fertilisation of 

 foxglove — Microscopic examination of pollen — Structure of 

 the pollen-grain — Fertilisation — Various kinds of pollen — 

 Enormous quantity of pollen produced — Showers of pollen 

 falling in the streets of towns — Marvels of function carried 

 on beyond the range of unaided human vision . Pp. 8^-107 



