By preference the Andamanese are exogamous as regards sept and endogamous as regards tribe.
It was not only by the formation of ever new endogamous castes and sub-castes that the system gained in extent and intricacy, but even more so by the constant subdivision of the castes into numerous exogamous groups or septs, themselves often involving gradations of social status important enough to seriously affect the possibility of intermarriage, already hampered by various other restrictions.
This sect counts numerous adherents in southern India; the Census Report of 1901 recording nearly a million and a half, including some 70 or 80 different, mostly endogamous, castes.
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