[583]. Lib. 1. de increm. Urb. cap. 6.
[584]. Cap. 5. de increm. urb. Quas flumen, lacus, aut mare alluit.
[585]. Incredibilem commoditatem, vectura mercium tres fluvii navigabiles, &c. Boterus de Gallia.
[586]. Herodotus.
[587]. Ind. Orient. cap. 2. Rotam in medio flumine constituunt, cui ex pellibus animalium consutos uteres appendunt, hi dum rota movetur, aquam per canales, &c.
[588]. Centum pedes lata fossa 30. alta.
[589]. Contrary to that of Archimedes, who holds the superficies of all waters even.
[590]. Lib. 1. cap. 3.
[591]. Dion. Pausanias, et Nic. Gerbelius. Munster. Cosm. Lib. 4. cap. 36. Ut brevior foret navigatio et minus periculosa.
[592]. Charles the great went about to make a channel from the Rhine to the Danube. Bil. Pirkimerus descript. Ger. the ruins are yet seen about Wessenburg from Rednich to Altimul. Ut navigabilia inter se Occidentis et Septentrionis littora fierent.