CONTENTS 



PAGE 



INTRODUCTORY ... i 



LECTURE I 

 THE ORIGIN OF SEX IN PLANTS 



LECTURE II 



THE EFFECT OF A FIXED POSITION ON THE SEXUALITY 



OF PLANTS 32 



LECTURE III 



THE REPRODUCTIVE PROCESS IN ANIMALS : SOME OF THE 



GENERAL PRINCIPLES 51 







LECTURE IV 



SOME OF THE MODIFICATIONS OF THE REPRODUCTIVE 



PROCESS AS ADAPTATIONS TO LIFE UPON LAND - 66 



