X TABLE OF CONTENTS. 



BOOK IV. 



P.-ige 



Ravagers of Forests, . . . . 216 



BOOK V. 



Protectors of Agriculture, 230 



BOOK VI. 



The Architecture of Birds, 23C 



Cliap. I. Giants ami Pigmies, 241 



II. The Instinct of Chemistry.— Mountain Builders and Gleaners, 250 



III. Work and the Family, .' 259 



IV. Idlers and Assassins, 268 



V. Architecture intended for Enjoyment, 278 



VI. Naval Arcliitecture, 282 



VII. Miners and Masons, 290 



„VIII. Weavers, 305 



BOOK VII. 



The ]Migr.4tions of Animals, 313 



Chaji. I. Migrations of Mammals 320 



„ II. Migrations (.f Birds, 326 



„ III. Migrations of Reptiles and Fishes. — Sho\Yers of Frogs, . . 345 



., IV. Migrations of Insects, 350 



THE VEGETABLE KINGDOM. 



BOOK I. 



The Anatojiy of Plants, 369 



t'hap. I. The Root, 375 



„ If. The Stem, 378 



„ III. Tlie Leaf, 3S4 



„ IV. The Flower, 3S7 



BOOK II. 



The PavsiOLixiY of Plants, 3,,,-; 



Cliap. I. Absori)tiou, oqq 



,, II. The Circulation in Plants, 41)^ 



„ III. The Eespii-ation of Plants, 4jo 



„ IV. Transpiration in Plants, 42q 



