Letter from George Gabriel Stokes, Lensfield Cottage, Cambridge, to Charles Vernon Boys Thanks Boys for the animated photograph which is an acceptable Christmas card. He could not see the interpretation of rays at first. He thinks they were stones or earth moving at high velocity from the point of explosion and discusses the camera angle. The photographs support the idea that highly condensed gas is thrown upward before expanding, which accounts for the complete dark ring. 25 December 1897