Were Saturn thus situated, what would the inhabitants of Herschel feel, whose distance is still further?--pursuing this train of reasoning, the heat in the planet Mercury would be seven times greater than on our globe, and were the earth in the same position, all the water on its surface would boil, and soon be turned into vapour, but as the degree of sensible heat in any planet _does not_ depend altogether on its nearness to the sun, the temperature of these planets may be as mild as that of the most genial climate of our globe. The theory of the sun being a body of fire having been long since exploded, and heat being found to be generated by the union of the sun's rays with the atmosphere of the earth, so the caloric contained in the atmosphere on the surfaces of the planets may be distributed in different quantities, according to the situation they occupy with regard to the sun, and which is put into action by the influence of the solar rays, so as to produce that degree of sensible heat requisite for each respective planet. We have only to suppose that a small quantity of caloric exists in Mercury, and a greater quantity in Herschel, which is fifty times farther from the sun than the other, and there is no reason to believe that those planets nearest the sun suffer under the action of excessive heat, or that the more distant are exposed to the rigours of insufferable cold, which, in either case, might render them unfit for the abodes of intellectual beings. PASCHE. * * * * * THE SKETCH BOOK NO. XLI. * * * * * THE AUTHOR AND HIS COAT. (_For the Mirror._)