Circumstances modifying these laws
Walker, Alexander
Intermarriage: or, The mode in which, and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity result from others: Demonstrated by delineations of the structure and forms, and descriptions of the functions and capacities, which each parent, in every pair, bestows on children,--in conformity with certain natural laws, and by an account of corresponding effects in the breeding of animals, p.239-251New York, NY: J & H G Langley
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