CONTENTS. 



NO. PAGE 



I. The Present Condition of Organic Nature 5 



II. The Past Condition of Organic Nature 28 



III. The Method by which the Causes of the Present and Past 



Conditions of Organic Nature are to be Discovered. — 

 The Origination of Liviug Beings ... 52 



IV. The Perpetuation of Living Beings, Hereditary Trans- 



mission and Variation 82 



V. The Conditions of Existence as affecting the Perpetua- 

 tion of Living Beings 10G 



VI. A Critical Examination of the Position of Mr. Darwin's 

 Work, "On the Origin of Species," in relation to the 

 complete Theory of the Causes of the Phenomena of 

 Organic Nature 132 



