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| (20) [XI]. Ad evidentiam igitur dicendorum, duo supponenda sunt: primum est quod aqua naturaliter movetur deorsum; secundum est quod aqua est labile corpus naturaliter, et non terminabile termino proprio. | (20) To prove what we have to say, two points must be conceded: the first is that water naturally moves downward, and the second that water is naturally a fluid body and incapable of being bounded by a boundary intrinsic to itself. |