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The same objections have been made to the definition of the kilogramme, at first considered as the mass of a cubic decimetre of water at 4° C., as to the first definition of the metre. Very remarkable researches have been carried out with regard to this determination by the International Bureau, and by MM. Macé de Lépinay and Buisson.
Louis Hébert had been granted the fief of the Sault au Matelot, and the fief Lepinay, while the Jesuits had received the fief of Notre Dame des Anges almost free of conditions. Under these favourable conditions Giffard induced two citizens of Mortagne, Zacharie Cloutier and Jean Guyon, to accompany him to Canada. Cloutier was a joiner, and Guyon a mason.
By making use of a somewhat similar idea, M. Macé de Lépinay and MM. Perot and Fabry, have lately effected by optical methods, measurements of the greatest precision, and no doubt further progress may still be made.
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