: Consanguineous Marriages in the American Population by Arner George B Louis George Byron Louis - Consanguinity United States

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INTRODUCTION

Problems to be Treated--Degrees of Consanguinity--Literature of the Subject--Noah Webster--Bemiss--Dally--G.H. Darwin--Huth--Bell--Legal Status in the United States--Methods of Investigation--Genealogical--Personal--Isolated Communities

RATIO OF THE CONSANGUINEOUS TO ALL MARRIAGES

Previous Estimates--Mayo-Smith--Mulhall--Darwin--Application of Darwin's Method to American Data--Direct Method--Consanguineal Attraction--Same-name and Different-name Cousin Marriages--Summary

MASCULINITY

Constancy of the Sex-ratio--Consanguinity and Masculinity--Theory of Westermarck and Thomas--Duesing--Gache--Negroes in the United States--Genealogical Material--Other Compilations--Summary

CONSANGUINITY AND REPRODUCTION

CONSANGUINITY AND MENTAL DEFECT

Idiocy and Insanity--Inheritability of Mental Defect--Intensified Heredity--Barr's Investigations--Other American and English Data--Mayet's Prussian Statistics--Genealogical Data

CONSANGUINITY AND THE SPECIAL SENSES

United States Census Data--The Blind--Consanguinity of Parents--Blind Relatives--Degree of Blindness--Causes of Blindness--Retinitis Pigmentosa--European Data--Probability of Blind Offspring of Consanguineous Marriages--The Deaf--Irish Census--Scotland and Norway--United States Census--Consanguinity of Parents--Deaf Relatives--Causes of Deafness--Degree of Deafness--Direct Inheritance of Deafness--Intensification through Consanguinity--Dr. Fay's Statistics--Personal Data--Probability of Deaf Offspring from Consanguineous Marriages--Opinion of Dr. Bell

SUMMARY AND CONCLUSION

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