02 – The Ovum

00 – Preface and Introduction

01 – Embryology; The Animal Cell

03 – The Spermatozoon; Fertilization of the Ovum

16 – Book 3 Chapter 3 – Confession of an Ardent Heart – in Verse

17 – Book 3 Chapter 4 – Confession of an Ardent Heart – in Anecdote

Chapter 16

1 - Introduction in Defence of Everything Else

34 – Book 5 Chapter 3 – The Brothers Make Friends

16 - Chapter 16

14 – Book Four, Sections V-X

16 – Book Four, Sections XIV-XVI