agreement we have is an indication that somewhere aloft there is a medium denser than this earth's atmosphere. I suppose our stronghold is in that such is not popular belief
Or the rhythm of all phenomena:
Air dense at sea level upon this earth—less and less dense as one ascends—then denser and denser. A good many bothersome questions arise
Our attitude:
Here are the data:
Luminous rains sometimes fall (Nature, March 9, 1882; Nature, 25-437). This is light that is not the light of incandescence, but no one can say that these occasional, or rare, rains come from this earth's externality. We simply note cold light of falling bodies. For luminous rain, snow, and dust, see Hartwig, "Aerial World," p. 319. As to luminous clouds, we have more nearly definite observations and opinions: they mark transition between the Old Dominant and the New Dominant. We have already noted the transition in Prof. Schwedoff's theory of external origin of some hailstones—and the implications that, to a former generation, seemed so preposterous—"droll" was the word—that there are in interplanetary regions volumes of water—whether they have fishes and frogs in them or not. Now our acceptance is that clouds sometimes come from external regions, having had origin from super-geographical lakes and oceans that we shall not attempt to chart, just at present—only suggesting to enterprising aviators—and we note that we put it all up to them, and show no inclination to go Columbussing on our own account—that they take bathing suits, or, rather, deep-sea-diving-suits along. So then that some clouds come from inter-planetary oceans—of the Super-Sargasso Sea—if we still accept the Super-Sargasso Sea—and shine, upon entering this earth's atmosphere. In Himmel und Erde, Feb., 1889—a phenomenon of transition of thirty years ago—Herr O. Jesse, in his observations upon luminous night-clouds, notes the great height of them, and drolly or sensibly suggests that some of them may have come from regions external to this earth. I suppose he means only from other planets. But it's a very droll and sensible idea either way.
In general I am accounting for a great deal of this earth's isolation: that it is relatively isolated by circumstances that are similar to the circumstances that make for relative isolation of the bottom of the ocean—except that there is a clumsiness of analogy now. To call ourselves deep-sea fishes has been convenient, but, in a quasi-
