If their Globe is divided like ours, into Sea and Land, as it’s evident it is (elſe whence could all thoſe Vapours in Jupiter proceed?) we have great Reaſon to allow them the Art of Navigation, and not vainly ingroſs ſo great, ſo uſeful a Thing to our ſelves. Eſpecially conſidering the great Advantages Jupiter and Saturn have for Sailing, in having ſo many Moons to direct their Courſe, by whoſe Guidance they may attain eaſily to the Knowledge that we are not Maſters of, of the Longitude of Places. And what a Multitude of other Things follow from this Allowance? If they have Ships, they muſt have Sails and Anchors, Ropes, Pullies, and Rudders, which are of particular Uſe in directing a Ship’s Courſe againſt the Wind, and in ſailing different Ways with the ſame Gale. And perhaps they may not be without the Uſe of the Compaſs too, for the magnetical Matter, which continually paſſes thro’ the Pores of our Earth, is of ſuch a Nature, that it’s very probable the Planets have ſomething like [They have Navigation, and all Arts ſubſervient.] it. But there’s no doubt but that they muſt have the Mechanical Arts and Aſtronomy, without which Navigation can no more ſubſiſt, than they can without Geometry. But Geometry ſtands in no need of being prov’d after this manner. Nor doth it want Aſſiſtance from other Arts which depend upon it, but we may have a nearer and ſhorter Aſſurance of their not being without it in thoſe Earths. For that Science is of ſuch ſingular Worth and Dignity, ſo peculiarly imploys the Underſtanding, and gives it ſuch a full Comprehenſion and infallible [As Geometry.] certainty of Truth, as no other Knowledge can pretend to: it is moreover of ſuch a Nature, that its Principles and Foundations muſt be ſo immutably the ſame in all Times and Places, that we cannot without Injuſtice pretend to monopolize it, and rob the reſt of the Univerſe of ſuch an incomparable Study. Nay Nature it ſelf invites us to be Geometricians; it preſents us with Geometrical Figures, with Circles and Squares, with Triangles, Polygones, and Spheres, and propoſes them as it were to our Conſideration and Study, which abſtracting from its Uſefulneſs, is moſt delightful and raviſhing. Who can read Euclid, or Apollonius, about the Circle, without Admiration? Or Archimedes of the Surface of the Sphere, and Quadrature of the Parabola without Amazement? or conſider the late ingenious Diſcoveries of the Moderns with Boldneſs and Unconcernedneſs? And all theſe Truths are as naked and open, and depend upon the ſame plain Principles and Axioms in Jupiter and Saturn as here, which makes it not improbable that there are in the Planets ſome who partake with us in theſe delightful and pleaſant Studies. But what’s the greateſt Argument with me, that there are ſuch, is their Uſe, I had almoſt ſaid Neceſſity, in moſt Affairs of humane Life. Now we are got thus far, what if we ſhould venture ſomewhat farther, and ſay, that they have our