Page:On an inversion of ideas as to the structure of the universe.djvu/30

 7. Mobility of the medium.

The singular surfaces, when their limited stability is overcome, are free to maintain their motions through the medium by a process of propagation in any direction—the number of grains forming up on the grains already in position being the same as those left behind; so that the grains in the nucleus have no mean motion whatever.

Any conception of this external propagation is difficult. But the process admits of such



. 6.