CONTENTS. 



KO. ' PAGE 



I. Tlie Present Condition of Organic Nature 1 



II. The Past Condition of Organic Nature 29 



III. Tlic Metliod by whicli the Causes of the Present and Past 



Conditions of Organic Nature are to be Discovered. — 

 The Origination of Living Beings ... ... ... 53 



IV. The Perpetuation of Living Beings, Hereditary Trans- 



mission and Variation 83 



V. The Conditions of Existence as affecting the Perpetua- 



tionof LivingBeings ... ... ... ... , ... 107 



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 133 



