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Pascal’s labours on the cycloid may be said to bring to a close his scientific career. There is still one invention, however, of a very practical kind, associated with the very last months of his life. Amongst the letters of Madame Périer, there is one of date March 24, 1662, addressed to M. Arnauld de Pompone —a nephew of the great Arnauld—in which she gives a lively description of the success of an experiment “dans l’affaire des carrosses.” The affair was nothing less than the trial on certain routes in Paris of what is now known as an “omnibus;” and the idea of such conveyances for the public—“carrosses
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