Investigation--Genealogical--Personal--Isolated Communities


CHAPTER II

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


CHAPTER III

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


CHAPTER IV

CONSANGUINITY AND REPRODUCTION

Theories of the Effect of Consanguinity upon Offspring--Comparative
Fertility--Statistics from Darwin and Bemiss--Genealogical
Statistics--Youthful Death-rate--Degeneracy--Fallacies in the Work of
Bemiss--Isolated Communities--_The Jukes_--Other Degenerate
Families--Scrofula