this Medium be exceeding great, it may suffice to impel Bodies from the denser parts of the Medium towards the rarer, with all that power which we call Gravity. And that the elastick force of this Medium is exceeding great, may be gather'd from the swiftness of its Vibrations. Sounds move about 1140 _English_ Feet in a second Minute of Time, and in seven or eight Minutes of Time they move about one hundred _English_ Miles. Light moves from the Sun to us in about seven or eight Minutes of Time, which...