... treatises on mechanics do not clearly distinguish between what is experiment, what is mathematical reasoning, what is convention, and what is hypothesis.
... les traités de mécanique ne distinguent pas bien nettement ce qui est expérience, ce qui est raisonnement mathématique, ce qui est convention, ce qui est hypothèse.
Original text (French)
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Notes from Wikiquote
Ch. VI: The Classical Mechanics, Tr. George Bruce Halsted (1913)