XVU1 CONTENTS. 



CHAPTER IV. 



Pagi 



action of leaves. 



Their Nature, Structure, Veins, Epidermis, Stomates. — Effect of 

 Light. — Digestion or Decomposition of Carbonic Acid. — 

 Insensible Perspiration. — Formation of Secretions. — Fall of 

 the Leaf. — Formation of Buds by Leaves . . . .87 



CHAPTER V. 



ACTION OF FLOWERS. 



Structure of Flowers. — Names of their Parts. — Tendency of the 

 Farts to alter and change into each other, and into Leaves. — 

 Double Flowers. — Analogy of Flowers to Branches.^-Cause 

 of the Production of Flowers. — Of Productiveness. — Of 

 Sterility. — Uses of the Parts of a Flower. — Fertilisation. — 

 Hybrids. — Crossbreds 66 



CHAPTER VL 



OF THE MATURATION OF THE FRUIT. 



Changes it undergoes. — Superior and inferior Fruit — Is fed by 



Branches upon organisable Matter furnished by Leaves. 



Physiological Use of the Fruit — Nature of Secretions. — The 

 Changes they undergo.— Effect of Heat — Of Sunlight. — Of 

 Water.— Seeds.— Origin of their Food. — Cause of their Lon- 

 gevity. — Of their Destruction. — Difference in their Vigour . 69 



CHAPTER VH. 



OF TEMPERATURE. 



Limits of Temperature endurable by Plants.— Effects of a too 



high Temperature. — Of a too low Temperature. — Frost 



Alternations of Temperature.— Day and Night— Winter and 

 Summer.— Temperature of Earth and Atmosphere . 79 



