CONTENTS. 



PAGE 



1. Introductory i 



2. Writers on Longevity, and general Sources of Information . 3 



A. Iiongevity in Organisms generally. 



3. Longevity defined 15 



4. The various kinds of Longevity . . ... 19 



5. Inherent Death 30 



6. Elements of the Life Period 45 



7. High Individuation favours Longevity 46 



8. Small Expenditure favours Longevity 47 



g. Why Longevity is thus influenced 50 



10. Inductive 54 



Statements as to Duration of the Individual in Organisms : — ■ 



Animals 55 



Vegetals 60 



Lord Bacon's Statements on the subject .... 62 



11. Other Relations of Longevity 80 



12. Some Experimental Evidence 84 



13. Summary 87 



B. The Longevity of Man. 



14. Preliminary 88 



15. Sources of Information as to Human Longevity . ... ^ 98 



b2 



