Plutarch, Quaestiones Convivales
Goodwin, Ed.

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But Favorinus himself, though in all other things he admires Aristotle exceedingly and thinks the Peripatetic philosophy to be most probable, yet in this case resolved to scour up an old musty opinion of Democritus. He first laid down that known principle of his, that images pass through the pores into the inmost parts of the body, and being carried upward cause dreams; and that these images fly from every thing, vessels, garments, plants, but especially from animals, because of their heat and the motion of their spirits; and that these images not only carry the outward shape and likeness of the bodies (as Epicurus thinks, following Democritus so far and no farther), but the very designs, motions, and passions of the soul; and with those entering into the bodies, as if they were living things, discover to those that receive them the thoughts and inclinations of the persons from whom they come, if so be that they preserve their frame and order entire. And that is especially preserved when the air is calm and clear, [p. 434] their passage then being quick and undisturbed. Now the autumnal air, when trees shed their leaves, being very uneven and disturbed, ruffles and disorders the images, and, hindering them in their passage, makes them weak and ineffectual; when, on the contrary, if they rise from warm and vigorous subjects, and are presently applied, the notices which they give and the impressions they make are clear and evident.