The institutions of man are as distinctly stratified as the earth on which he lives. They succeed each other in series substantially uniform over the globe, independent of what seem the comparatively superficial differences of race and language, but shaped by similar human nature acting through successively changed conditions in savage, barbaric, and civilized life.1

1Tylor, E.B.n/an/an/an/a, "On a Method of Investigating the Development of Institutions. . .," , 18: 269.