Cum ergo et a physicis et philosophis et ab sacerdotibus iudicetur ex potestate aquae omnes res constare, putavi, quoniam in prioribus septem voluminibus rationes aedificiorum sunt expositae, in hoc oportere de inventionibus aquae, quasque habeat in locorum proprietatibus virtutes, quibusque rationibus ducatur, et quemadmodum ante probetur, scribere.
Therefore, inasmuch as physicists philosophers and the clergy judge that everything consists of the principle of water, I thought fit that, having explained in the previous seven volumes the methods of building, I should write in the present volume about the discovery of water, the qualities of its special sources, the methods of water-supply and of testing water before using it.
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