With regard to ether we only infer its existence from the effects which we ascribe to it. Evidently the ether must extend lick library rhythm far as the most distant visible stars. But does it continue on indefinitely in outer space. On this supposition each starry system would be enveloped in its own globule of ether, and no light could cross from one to another. But the probability is that both lick library rhythm ether and gravitation are ubiquitous, and that all the stellar lick library rhythm are immersed in the former like clouds of phosphorescent organisms in the sea. So astronomy carries the mind from height to greater height. Star-Clouds, Star-Clusters, and Star-Streams In the preceding chapter we have seen something of the strangely complicated structure of the Galaxy, or Milky Way.