xliv CONTENTS. 



CHAPTER XXX. 



CLASSIFICATION. 



SECTION PAGK 



1. Classification 673 



2. Classification involving Induction 075 



3. Multiplicity of Modes of Classification 677 



4. Natural and Artificial Systems of Classification 679 



r>. Correlation of Properties 681 



6. Classification in Crystallography 685 



7. Classification an Inverse and Tentative Operation 689 



8. Symbolic Statement of the Theory of Classification .... 692 



9. Bifurcate Classification 694 



10. The Five Predicablcs 698 



11. Summum Genus and Infima Species 701 



12. The Tree of Porphyry 702 



13. Does Abstraction imply Generalisation ? 704 



14. Discovery of Marks or Chara.cteristics 70S 



15. Diagnostic Systems of Classification 710 



16. Index Classifications 714 



17. Classification in the P>iological Sciences 718 



18. Classification by Types _ 722 



19. Natural Genera and Species 724 



20. Unique or Exceptional Objects 728 



21. Limits of Classification 730 



BOOK VI. 



CHAPTER XXXI. 



r.EFLECTIONS ON THE RESULTS AND LIMITS OF SCIENTIFIC METUOn. 



1. Reflections on the Results and Limits of Scientific Method . . 735 



2. The Meaning of Natural Law 737 



3. Infiniteness of the Universe 738 



4. The Indeterminate Problem of Creation 740 



5. Hierarchy of Natural Laws 742 



6. The Ambiguous Expression — " Uniformity of Nature " . . . 745 



7. Possible States of the Universe 749 



8. Speculations on the Reconeeutration of Energy 751 



9. The Divergent Scojie for New Discovery 752 



10. Infinite Incompleteness of the Mathematical Sciences . . . 754 



11. The Reign of Law in Mental and Social Phenomena .... 759 



12. The Theory of Evolution 701 



13. Possiliility of Divine Interference 765 



14. Conclusion 766 



INDEX 773 



