It would appear that they believe everything, both animate and inanimate — beasts, arms, ornaments, etc.— to possess immortal attributes, subject to resurrection in the world of spirits. However, did not their motives seem so well defined by the direct allusions to their notions of futurity, we might suppose, as is frequently urged, that the burying of property, slaves, etc., with the deceased, was only intended as a mark of respect; which, indeed, is hardly more irrational than the custom of interring costly garniture and appendages with the dead among us.

Commerce of the Prairies (1831–1839), Chapter 28 Aborigines Of America