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Superficies ex quibus solida componuntur, hic non sunt pure Mathematicae, sed Orbes adeo tenues ut eorum crassitudo instar nihili sit; nimirum Orbes evanescentes ex quibus Sphaera ultimo constat, ubi Orbium illorum numerus augetur & crassitudo minu∣itur in infinitum, juxta Methodum sub initio in Lemmatis genera∣libus expositam. Similiter per puncta, ex quibus lineae, superfici∣es & solida componi dicuntur, intelligendae sunt particulae aequa∣les magnitudinis contemnendae.