xvi CONTENTS. 
Difficulties on the Theory of Natural Selection—The Origin of Some 
of Man’s Mental Faculties, by the preservation of Useful Variations, 
not possible—Difficulty as to the Origin of the Moral Sense—Sum- 
mary of the Argument as to the Insufficiency of Natural Selection to 
account for the Development of Man—The Origin of Consciousness 
—The Nature of Matter—Matter is Force—All Force is probably 
Will-force—Conclusion . «. «© . « Pp, 332—871 
