Summer on the Lakes, in 1843
“Galen was indebted to his nightly dreams for a part of his medical knowledge.”
Fuller, Margaret. Summer on the Lakes, in 1843. Boston: Little, Brown & Co., 1844.
Inferred Fuller mentions Galen as an authority whose medical knowledge was partially derived from dreams, in the context of discussing the Seherin's prophetic and healing gifts. This is a well-documented tradition about Galen (in his own writings, e.g.