Note 137:5 — Chapter V

That the scientist still permits himself to teach the people a loose exoteric theory of reality, is proven by Professor Ward's citation of instances in his Naturalism and Agnosticism. So eminent a physicist as Lord Kelvin is quoted as follows: "You can imagine particles of something, the thing whose motion constitutes light. This thing we call the luminiferous ether. That is the only substance we are confident of in dynamics. One thing we are sure of, and that is the reality and substantiality of the luminiferous ether." Vol. I, p. 113.