CONTENTS 



PART I. THE ANIMAL KINGDOM. 



CHAPTER. PAGE 



I. The Grasshopper and other Orthoptera i 



II. How Animals are Classified 17 



III. The Lepidoptera or Butterflies and Moths 20 



IV. The Hemiptera, or the Bugs and their Allies 31 



V. The Diptera or Flies ; . . 40 



VI. The Coleoptera or Beetles 51 



VII. The Hymenoptera or Bees, Ants, Wasps and their Allies. . 56 



VIII. The Dragon Flies, Damsel Flies, May Flies, Stone Flies 

 and Caddis Flies ,._ 70 



IX. The Myriapods and Arachnids 75 



X. The Crayfish and Other Crustacea 84 



XI. The Mollusca 98 



XII. The Echinoderms 108 



XIII. The Ringed Worms or Annelids 114 



XIV. The Round Worms and Flat Worms 122 



XV. The Coelenterates and Sponges 130 



XVI. The Protozoa or the Simplest Animals 141 



XVII. The Lowest Vertebrates and their Nearest Allies 153 



XVIII. The Fishes 158 



XIX. The Amphibia (Frogs, Toads, Newts and Salamanders).. 169 



XX. The Reptiles 176 



XXI. The Birds 183 



XXII. The Mammals 209 



PART II. THE ELEMENTS OF PHYSIOLOGY. 



XXIII. The Chemical Basis of Life 232 



XXIV. Cells and Tissues 240 



XXV. Digestion 245 



XXVI. Foods and Their Uses 252 



ix 



