Systems of Consanguinity and Affinity of the Human Family
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Lewis Henry Morgan's Systems of Consanguinity and Affinity of the Human Family (1871) is a foundational work in anthropology that established the scientific study of kinship systems. Morgan investigated how different cultures designated relatives, noting significant variations from the Anglo-American convention. He discovered that kinship terms varied widely, leading him to distinguish between "descriptive" systems, which differentiate lineal and collateral kin, and "classificatory" systems, where some collateral relatives share terms with lineal ones.12
Morgan's research into kinship terminology led to his theory of social evolution, proposing that societies progressed through stages from "savagery" to "barbarism" and finally to "civilization," driven by changes in food production and technology. While his evolutionary stages have been largely superseded, his work on kinship systems remains influential.13
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