New and Original Theories of the Great Physical Forces. Henry Raymond Rogers

      Sunlight is one of the products of that grand retro-action which is incessantly in operation between sun and earth, and is, in its intimate and essential nature, a vito-magnetic fluid[B] (or so-called magnetic). Subtle, and apparently intangible, manifesting itself rather as a presence than a real substance, it fills all the space between the sun and earth—which space may, with sufficient accuracy, be termed the solar cone or cone-space.