but before I believe that he has done so, give me reasonable and adequate evidence of so wonderful and sublime a fact; or I must believe in any kind of nonsense that any one can imagine. The planet Jupiter affords a fair sample of the procedure of the Essayist and his opponent, with reference to all the other primary planets of the Solar system. From Mercury, in red-hot contiguity to the Sun, to Neptune, which is at thirty times the Earth’s distance from it, and from which as we have seen it derives only _one nine-hundredth_ part of the light and heat imparted to ourselves by the Sun,—Sir David Brewster will have all inhabited, and the physical condition of each correspondingly altered to admit of it: central heat, and eyes the pupils of which are sufficiently enlarged, and the retina’s sensibility sufficiently increased, to admit of seeing with nine hundred times less light than is requisite for our own organs of sight! “Uranus and Neptune,” concludes the triumphant Pluralist[93]—nothing daunted by the overwhelming evidences of physical difference of condition—“are _doubtless_”—with the Sun—“the abodes of Life and Intelligence: the colossal temples where their Creator is recognised and worshipped—the remotest watch-towers of our system, from which his works may be _better_ studied, and his glories _more easily_ descried!” Why, with such elastic principles of analogy as his, stop short of peopling the Meteoric Stones with rational inhabitants? whom, and whose doings, as in the case of the Moon, “some magnificent” instrument, yet to be constructed, may discover to us? Thus much for the planets,—before quitting which, however, we may state that, according to Dr Lardner, about as staunch a Pluralist as his admirer Sir David Brewster, a greater rapidity of rotation, and smaller intervals of light and darkness, are among the characteristics distinguishing the group of major planets from the terrestrial group. He also adds that another “striking distinction” is the comparative lightness of the matter constituting the former. The density of Venus, Mars, and our earth, is nearly equal—about the same as that of ironstone; while the density of the thoroughly-baked planet Mercury is equal to that of gold. “Now it appears, on the contrary,” he continues, “that the density of Jupiter very little exceeds that of water; that of Uranus and Neptune is exactly that of water; while Saturn is so light, that it would float in water like a globe of pine wood.... The seas and oceans of these planets must consist of a liquid far lighter than water. It is computed that a liquid on Jupiter, which would be analogous to the terrestrial oceans, would be three times lighter than sulphuric ether, the lightest known liquid; and would be such that cork would scarcely float in it!”[94]