66vQuod si, rursus, trabes gravior fuerit aqua illa quae a trabe est attollenda, hoc est si trabes gravior fuerit tanta aqua, quanta est sua moles propria (attollitur enim a trabe demersa, ut saepius dictum est, tanta moles aquae quanta est suamet moles), tunc trabes certe deorsum feretur: quod quidem proportione respondet ei quod in lance dictum est,
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