CONTENTS ix 



CHAPTER PAGE 



XLII. Multiplication in Plants 466 



XLIII. Multiplication in Animals 481 



XLIV. Improving Qualities in Plants and Animals . . . 491 



XLV. Plant Breeding 504 



XLVI. Animal Breeding 5^9 



CONSERVATION 



XLVII. The Earth for Mankind .... 



XLVIII. The Forest in Relation to Man 



XLIX. Insects in Relation to Human Wealth 



L. Birds in Relation to Man .... 



LI. People for the Earth 



532 



549 

 561 



574 

 580 



INDEX 



