The restrictions as to intercourse between certain relations, which are so widespread in North America, exist also among the Arapaho. A man and his mother-in-law may not look at or speak to each other. If, however, he gives her a horse, he may speak to her and see her. The same restrictions exist between father and daughter-in-law as between mother and son-in-law, say the Arapaho (though perhaps they are less rigid).2

1Lowie, R.H.n/an/an/an/a, "Notes on the Social Organization and Customs of the Mandan, Hidatsa, and Crow Indians," Amer. Mus. Nat. Hist., Anth. Pap., 21: 91.

2 Kroeber, A. L., "The Arapaho," Amer. Mus. Nat. Hist., Anth. Pap., 18: 10.