Wildberg, Christian, "John Philoponus", The Stanford Encyclopedia of Philosophy (Winter 2018 Edition), Edward N. Zalta (ed.) "As regards the natural motion of bodies falling through a medium, it was Aristotle's contention that the speed is proportional to the weight of the moving bodies and indirectly proportional to the density of the medium. Philoponus repudiates this view by appeal to the same kind of experiment that Galileo was to carry out centuries later (In Phys. 682–84)."
