8 CONTENTS. . 



Page 

 Clothing of Animals 74 



Sleep of Animals 77 



Migration of Animals ; Birds of Passage 80 



First Class of Animal ; Mammalia 83 



Mammalia of the Sea. . < 87 



Utility of the Mammalia to Man 90 



Birds in general 93 



Structure of Birds 96 



Food of Birds; the Condor 99 



Plumage of Birds ; Song Birds 102 



Birds' Nests ; Age t)f Birds 106 



Services rendered by Birds 110 



Reptiles ; Poisonous Animals 113 



Habits of Reptiles 117 



Age of Reptiles 121 



Fishes ; their Migrations 125 



Fins of Fish ; Air-bladder ; Electric Fish 128 



Herrings ; Salmon ; Remora 131 



Insects in general 134 



Trunk or Tongue of Insects ; Wings ; Feet 137 



Habits of Insects 140 



Changes of Insects 145 



Usefulness of Insects. 148 



Molluscous Animals 151 



Shells ; Pearls 1 54 



Zoophytes ; Coral ; Sponges 157 



The vegetable Kingdom 160 



Roots; Seeds; Buds 163 



Flowers ; Structure, Size, Odour 166 



Periods of Flowering ; Diffusion of Seeds 170 



Trees ; their Usefulness 173 



Fruit ; Grasses ; Vegetables 177 



Moss ; Fungi ; Ferns ; Lichens. ; Sea-weed 180 



The Mineral Kingdom 183 



Metals t 186 



Iron, Copper, Tin, and Lead 189 



Coal, Sulphur, and Naphtha 192 



Rocks; Slate, Clay, Salt 195 



