Psyche & Symbol: The Origin of Elementary Ideas
Joseph Campbell recounts German Anthropologist, Adolf Bastian, determining and defining the “Elementary ideas”
For more on Adolf Bastian and “Elementary Ideas,” see:
Mythos I: The Shaping of Our Mythic Tradition (https://www.jcf.org/works/mythos-series/)
Masks of God: Primitive Mythology (https://www.jcf.org/works/primitive-mythology-10/)