AMPHIMIXIS, Etc. 



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CONTENTS. 



Introduction 



I. The Significance of the Process of Maturation of the Germ- 



II. Inheritance in Parthenogenetic Reproduction 



The Processes of Maturation in Parthenogenetic Eggs and their 



Meaning 



Observations on Inheritance in Parthenogenesis .... 



The Origin of Parthenogenetic Eggs from those which require 



Fertilization ......... 



III. Amphimixis as the Significance of Conjugation and Fer- 



tilization 



The Facts of Conjugation . 

 Meaning of the Phenotnena 

 Objections ...... 



The Deeper Significance of Conjugation 

 Amphitnixis in all Unicellular Organisms 

 The Theories of Rejuvenescence and of Mingling 

 Does Natural Death occur in Unicellular Organisms ? 

 The Appearance of Amphimixis in the Organic World 



PAGF. 



105 



114 

 114 

 117 



CELLS .......... 



The Maturation of the Ovum. ....... 



The Maturation of the Spermatozoon ...... 



The Double Division of the Nuclear Substance in the Formation of 



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



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



Objections . . . . . . . . . . ,146 



150 



150 

 159 



170 



176 

 176 

 182 

 187 

 189 



193 

 195 

 203 



210 



