AMPHIMIXIS, Etc. 



CONTENTS. 



PAGE 



Introductiox 105 



I. The SIGNIFICA^'CE of the Process of Maturation of the Germ- 



cells 114 



The Maturation of the Ovmn 114 



The Maturation of the Spermatozoon . . . . . .117 



The Double Division of the Nuclear Substance in the Formation of 



Germ-cells . . . . . . . . . .123 



Other Types of Maturation of Germ- cells ..... 138 



Objections 146 



II. Inheritance in Parthenogenetic Reproduction . . . 150 



The Processes of Maturation in Pat-thenogenetic Eggs and their 



Meaning .......... 150 



Observations on Inheritance in Parthenogenesis .... 159 



The Origin of Parthenogenetic Eggs from those which require 



Fertilization 17° 



III. Amphimixis as the Significance of Conjugation and Fer- 



tilization 176 



The Facts of Conjugation 176 



Meaning of the Phenomena ....... 182 



Objections 187 



The Deeper Significance of Conjugation . . . . .189 



Amphimixis in all Unicellular Organisms I93 



The Theories of Rejuvenescence and of Mingling . . . . 195 

 Does Natural Death occur in Unicellular Organisms ? . . 203 

 The Appearance of Amphimixis in the Organic World . .210 



