There are certain spirits, not very talkative, but still serviceable in further bringing down farther the mental imagery of others; and they are likewise passive, and quite modest. They were heard even higher overhead, their general motion being a flowing one in the brain crosswise from the front to the back. Then there was another kind of these spirits whose general motion was a flowing one across from each temple toward the middle of the brain, as if coming together where the longitudinal sinus is located.