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Si corporis attracti, ubi attrahenti contiguum est, attractio longe fortior sit, quam cum vel minimo intervallo separantur ab invicem: vires particularum trahentis, in recessu corporis attracti, decrescunt in ra∣tione plusquam duplicata distantiarum a particulis.
Nam si vires decrescunt in ratione duplicata distantiarum a particulis; attractio versus corpus Sphaericum, propterea quod (per Prop. LXXIV.) sit reciproce ut quadratum distantiae at∣tracti
corporis a centro Sphaerae, haud sensibiliter augebitur ex contactu; at{que} adhuc minus augebitur ex contactu, si attractio in recessu corporis attracti decrescat in ratione minore. Patet igi∣tur Propositio de Sphaeris attractivis. Et par est ratio Orbium Sphaericorum concavorum corpora externa trahentium. Et mul∣to magis res constat in Orbibus corpora interius constituta tra∣hentibus, cum attractiones passim per Orbium cavitates ab at∣tractionibus contrariis (per Prop. LXX.) tollantur, ideo{que} vel in ipso contactu nullae sunt. Quod si Sphaeris hisce Orbibus{que} Sphaericis partes quaelibet a loco contactus remotae auferantur, & partes novae ubivis addantur: mutari possunt figurae horum cor∣porum attractivorum pro lubitu, nec tamen partes additae vel subductae, cum sint a loco contactus remotae, augebunt notabi∣liter attractionis excessum qui ex contactu oritur. Constat igi∣tur Propositio de corporibus figurarum omnium. Q.E.D.