Concerns a suggestion by Cullen for Crookes to perform an experiment to investigate spiritualism. Crookes states that he has given up these investigations to focus on radiation.
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Crookes, William. “Letter from William Crookes to Henry Collen,” November 13, 1875. Szymanowitz Autographed Letter Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/vm40xr57v.
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