adjective: of or relating to interstices
In`ter*sti"tial (?), a. Of or pertaining to interstices; intermediate; within the tissues; as, interstitial cavities or spaces in the tissues of animals or plants. Interstitial or between bodies, entities, atoms or molecules.
"I have spoken elsewhere of the almost infinite difficulties of getting into position, to hold hydrogen gas in suspension between soap film a proper period of time, to conduct these experiments. The setting of the other parts of the apparatus is quite easy in comparison. All wave propagations, electromagnetic or otherwise by being thus refracted can be measured in regard to the time of their propagation all of which are introductorily subservient to the luminiferous ether. The theory put forward by "men of science" in regard to electromagnetic forces shows that they are misled by the imperfection of their instruments. They are trying to measure the infinite by the finite, necessitating terms of avoidance, to the instantaneous propagation of nature's sympathetic evolutions, of the same nature as the one advanced in the assertion that a force does not exist in the interstitial embrace of all matter. ELECTROMAGNETIC RADIATION - Snell
"Were our sight able to penetrate the interstitial spaces that exist inside the orbits of the oscillating intermolecules and analyze the conditions in those interstitial spaces, where dwells incalculable latent energy, we would be bewildered with amazement. And assuming our vision, which is limited by persistency, could follow the intermolecules in their rapid oscillations and the intermolecular etheric capsule as it revolves with infinite velocity like a transparent shell about the three component atoms that exist inside it, which in turn revolve in their orbits and oscillate with even a higher frequency than the intermolecules, we would still be only on the border gazing into the remote depths of the interstitial realms that stretch far down into the interatomic, etheric and interetheric subdivisions, and, within the interetheric subdivision at last arrive at the neutral center, the nucleus of everything we know as substance. This neutral center bears about the same relation to the etheric subdivision that the atomic subdivision bears to the crude molecular, in other words, its texture is as much finer than electrons as electrons are finer than coarse molecules." [INTERSTITIAL SPACES]
Latent Force in Interstitial Spaces
LATENT FORCE IN INTERSTITIAL SPACES - ELECTROMAGNETIC RADIATION - MOLECULAR DISSOCIATION
LATENT FORCE IN INTERSTITIAL SPACES - Snell