The potential for accurately reconstructing prehistoric Woodland and Plains Indian societies' notions of human soul-like essences using symbolically rich mortuary remains and art can be improved when analogous, comparative ethnohistorical information is collected systematically and with sensitivity to tribal and regional variations. Literature on 49 historic Woodland-Plains tribes produced 643 cases informing on nine selected subjects: number and locations of souls in an individual, number of souls that leave the body in life and death, where and when they exit, and their functions and qualities in life and death. Ideas varied considerably but patterned in their frequencies and geographic distributions.