He prepared a new edition of the monk Theophilus' celebrated treatise, Diversarum artium schedula, and for several years devoted his Saturday mornings to laboratory research with the chemist Aimé Girard at the Conservatoire des Arts et Métiers, the results of which were utilized by Marcellin Berthelot in the first volume (1894) of his Chimie au moyen âge.
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Besides the professional experts, savants such as Paul Meyer, Arthur Giry, Louis Havet, and Auguste Molinier affirmed and proved that the writing and the style of the bordereau were those of Esterhazy.