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Updated: August 18, 2026
The Mills had spoken of mental chemistry; Wundt of a 'psychic synthesis, which might develop properties not contained in the elements; and such writers as Spencer, Taine, Fiske, Barratt, and Clifford had propounded a great evolutionary theory in which, in the absence of souls, selves, or other principles of unity, primordial units of mind-stuff or mind-dust were represented as summing themselves together in successive stages of compounding and re-compounding, and thus engendering our higher and more complex states of mind.
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