In the nineteenth century, many people accepted as scientifically valid not only face-reading, or physiognomy, but also head reading, or ph The bumps on a person's cranium, they thought, revealed his or her personality, so did the shape of the mouth or the tilt of the nose. Today's thinking bas it that what goes on in the brain does not depend on the face and y just as astrology continues to flourish in a scientific world, so too does"plays phren", as the combination has come to be called, remain with us in the 1980's. 81. at is the main topic of the passage?