CONTENTS 



CHAPTER PACE 



Preface vii 



I. Childhood and Youth i 



II. LARv^iE AND Metamorphoses 17 



III. The Duration of Youth in Mammals 37 



IV. The Duration of Youth in Birds and Lower Animals 49 

 V. Colour and Pattern in Animals 62 



VI. Colours and Patterns of Young Mammals 81 



VII. Colours a:>id Patterns of Young Birds 97 



VIII. Limitation of Families 115 

 IX. Brood-care and Limitation of Families in Lower 



Vertebrates i 34 



X. Brood-care in Birds 14? 



XI. Brood-care among Mammals 163 



XII. The Food of Young Animals 183 



XIII. The Taming of Young Animals 204 



XIV. The Purpose of Youth 222 

 XV. Education 239 



I DEX 257 



