Einstein’s theory of relativity was one of the giant leaps of the human intellect. So impressive was it that for years most physicists have accepted it as the fundamental law of the universe, even ...

THE relation of space and æther has been a subject of controversy. Three-dimensional absolute space has been regarded, before Einstein, as filled with a substantial æther. It is unnecessary to ...

The old scientific concept of the ether —an all-pervading medium which transmits light and gravitational force—is a nine-lived cat. Supposedly killed off several times, it still keeps pattering around ...

In original printed wrappers which include [2] p. of publisher's advertisements, variant to those of the other German issue of the same year. Also published with variant subtitle in Dutch: Aether und ...