But, yet He hath left us rather a Confusion, than logical Discrimination of the species of Violent motion; for, Collision and Pulsion are one and the same thing; and Vection may be performed either by Pulsion or Traction, insomuch as the thing movent doth not forsake the thing pulsed, or drawn, but constantly adhæreth unto it; and as for Volutation; it is both Pulsion and Traction at once, as may be easily conceived by any man who seriously considers the manner thereof.
Source: wiktionary