CONTENTS. ix 



Chief Divisions of the Four Principles — Continued. 



Modes of the Four Principles 80 



Reflexive Mode of Influence 81 



Methods of the Reflexive Mode of each Principle 82-1 14 



The Forms of the Conjunctional Method 83 



Sexual Form of Selection, Election, and Isolation 83 



Social Form of Selection, Election, Isolation, and Partition 84 



Filio-parental Form of Selection and Election 86 



Forms of the Dominational Method 86 



Forms of the Impregnational Method 87 



Dimensional Form of Impregnational Selection and of Isolation 88 



Structural Form of Impregnational Selection and of Isolation 88 



Potential Form of Selection and Isolation 89 



Fecundal Selection, Initial Fertility, and Final Fertility — Coordina- 

 tion is Secured by a Form of Filio-parental Selection — Some 



Domestic Fowls Illustrate Exaggerated Initial Fertility 90-92 



Fecundal Selection in Human Races — Loss of Fertility in the Poly- 

 nesian Race; not in the African Race 92 



Statistical Methods in the Study of Fertility — Karl Pearson on Fer- 

 tility in Man 92-95 



Importance of Impregnational Isolation 95-100 



Segregate Freedom from Competition and Segregate Escape from 



Enemies loi 



Computation of Ratio of Cross-breeds to Pure-breeds — A Parallel 



Financial Problem — Table from Formula (4) 103-106 



Use of Tables 107 



Cumulative Segregation Resulting from Segregative Endowments. . 108 



Institutional and Prudential Selection 1 1 1 



Institutional Election, Isolation, and Partition 114 



Chapter VII. — Analysis op the Four Principles (Continued). 



Methods and Forms of Environal Mode of Each Principle 11 5-1 29 



Environal Selection and Election 1 15 



Environal Isolation "8 



Industrial Isolation — Sustentational, Protectional, and Nidifica- 



tional 119-123 



Chronal Isolation — CycUcal and Seasonal 1 23-1 25 



Spatial Isolation — Geographical and Local; Migrational, Transpor- 



tational, and Geological 125-127 



Fertilizational Isolation 128 



Artificial Isolation — Importance of Environal Isolation 128 



Environal Partition 129 



Regressive Mode of Each Principle 129-131 



Reversal of Partition and Isolation in Man 1 30 



Isolation Prevents Reflexive Selection between Groups 131 



Discriminate and Indiscriminate Action of Principles 132-136 



Discriminate Action 132 



Indiscriminate Action '33 



Contrasts in Their Action i34 



Table of Discriminate and Indiscriminate Modes of the Four 



Principles '36 



