Page:The Poison Belt - Conan Doyle, 1913.djvu/28

 Rh  cosmic change of a subtle and singular character. Light from a planet is the reflected light of the sun. Light from a star is a self-produced light. But the spectra both from planets and stars have, in this instance, all undergone the same change. Is it, then, a change in those planets and stars? To me such an idea is inconceivable. What common change could simultaneously come upon them all? Is it a change in our own atmosphere? It is possible, but in the highest degree improbable, since we see no signs of it around us, and chemical analysis has failed to reveal it. What, then, is the third possibility? That it may be a change in the conducting medium, in that infinitely fine ether which extends from star to star and pervades the whole universe. Deep in that ocean we are floating upon a slow current. Might that current not drift us into belts of ether which are novel and have properties of which we have never conceived? There is a