A scholar, who in the main belongs to the same group and who is one of the foremost students of the laws and usages of savage and barbarous peoples, is Post, whose more important writings are _Die Geschlechtsgenossenschaft der Urzeit_ (Oldenburg, 1875); _Der Ursprung des Rechts_ (Oldenburg, 1876); _Die Anfänge des Staats- und Rechtsleben_ (Oldenburg, 1878); _Die Grundlagen des Rechts_ (Oldenburg, 1884); _Einleitung in das Studium der ethnologischen Jurisprudenz_ (Oldenburg, 1886); _Afrikanische Jurisprudenz_ (Oldenburg and Leipzig, 1887); _Studien zur Entwicklungsgeschichte des Familienrechts_ (Oldenburg and Leipzig, 1889); and "Die Kodifikation des Rechts der Amaxosa von 1891," in _ZVR._, XI. The last-named paper may be read in connection with Rehme's "Ueber das Recht der Amaxosa," in _ZVR._, X; Kohler's "Ueber das Negerrecht, namentlich in Kamerun," _ibid._, XI; Bertholon, "Les formes de la famille," in _Arch. de l'anth. crim._, VIII (1893); Zöller, _Forschungsreisen in der Kolonie Kamerun_ (Berlin and Stuttgart, 1886); the _Kamerun_ of Buchner (Leipzig, 1887); Munzinger's _Ostafrikanische Studien_ (Schaffhausen, 1864); the important work of Fritsch, _Die Eingeborenen Süd-Afrikas_ (Breslau, 1872), treating of the family customs of various aboriginal tribes; Kranz, _Natur- und Kulturleben der Zulus_ (Wiesbaden, 1880); Kingsley, _Travels in West Africa_ (London, 1897); Tillinghast, _The Negro in Africa and America_ (New York, 1902). By entirely different routes the theories of universal communism and mother-right were reached by Lewis H. Morgan, beginning with the _League of the Iroquois_ (Rochester, 1851); followed by his great work on _Systems of Consanguinity and Affinity_ (Washington, 1871); the systematic treatise entitled _Ancient Society_ (New York, 1878); and the _Houses and House-Life of the American Aborigines_ (Washington, 1881); and by J. F. McLennan, _Primitive Marriage_ (1865); reprinted with other papers as _Studies in Ancient History_ (London, 1876). After the author's death appeared the _Patriarchal Theory_ (London, 1885), edited and completed by his brother Donald McLennan; and the second series of _Studies_ (London and New York, 1896), edited by his widow and Arthur Platt.