… if, from a point marked on a horizontal … infinitely many straight lines … these [uniformly] movable points would consequently make out … [p. 224] This aroused my wonder [about natural acceleration. Consider two circles tangent at A, with vertical diameters AI and AB, and two chords AEF and AGH.] … It is evident from the preceding demonstrations that … when one [moveable] is at E, another will … [later] be found at the same instant of time at F, … [p. 225] Thus from the two species of motion … [And in three dimensions, the production of infinitely many spheres.]
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