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THis is in the first place evident from the genesis of the ellipse we deduced in Schol. 1. Prop. 7. for in that de∣duction we shewed that FO, i. e. HN was to NI as AB to DE: Which since it is true of all the other indivisibles or or∣dinates HN and IN ad infinitum; it is manifest that the planes themselves constituted of these indivisibles will have the same reason among themselves, as the Axis Rectus AB to the trans∣verse DE. Q. E. D.