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178
A Short History of Astronomy
[Ch. VI., § 134

Galilei's own statement of it, as applied to a particular case:—

"Let us therefore take this at present as a Postulatum, the truth whereof we shall afterwards find established, when we shall see other conclusions built upon this Hypothesis, to answer and most exactly to agree with Experience."[1]
  1. Two New Sciences, translated by Weston, p. 255.