ABSENCE OF MEDIUM WOULD INTERFERE WITH VISION ONLY BY DESTROYING SYMPATHY.
It might indeed be objected that without medium, vision ceases. This occurs not because of the lack of medium, but because the sympathy of the (universal) organism is in such a case destroyed since a medium presupposes that all the parts of this organism together form but a single being. It would indeed seem to be a general condition necessary for sensation that the universal organism be sympathetic with itself; otherwise, no one thing could participate in the power of any other thing that might happen to be very distant.