CONTENTS. 



HO. PAQB 



I. The Present Condition of Organic Nature ... 7 

 II. The Past Condition of Organic Nature . . . .29 



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



Past Conditions of Organic Nature are to be Discov- 

 ered. — The Origination of Living Beings . . .52 



IV. The Perpetuation of Living Beings, Hereditary Trans- 



mission and Variation 80 



V. The Conditions of Existence as affecting the Perpetua- 

 tion of Living Beings 102 



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 127 



