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CONTENTS.
Page.
Abstract 5
I. Introduction 9
II. Material and Methods 11
III. Survey of the Strains; their Founders 13
IV. Line A 16
V. Line B 25
VI. Line C 29
VII. Line D 35
VIII. Line E 51
IX. Line F 52
X. Line G 62
XI. Continuation of Line E 71
XII. General Summary of Lines 77
XIII. Heritability of Socially Effective Traits 78
1. Calculating Ability 78
2. Aggressiveness 82
3. Perseverance 84
XIV. Statistics 86
1. The Population Considered 86
2. Comparative Efficiency of the Several Lines 86
3. Comparative Fecundity 88
4. Comparative Survival 89
5. Differential Migration 89
XV. Relative Effect of Environment and the Blood 91
XVI. Marriage Selection 94
XVII. Immigration 97
XVIII. Conclusion 100
Reference 102

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Publication Information: Book Title: Heredity and Social Fitness: A Study of Differential Mating in a Pennsylvania Family. Contributors: Wilhelmine E. Key - author. Publisher: The Carnegie Institution of Washington. Place of Publication: Washington, DC. Publication Year: 1920. Page Number: 3.
    
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