Our work on the logic of Leibniz was almost completed (at least we thought so) when we had the pleasure, at the International Congress of Philosophy (August, 1900), of making the acquaintance of Mr Giovanni Vacca, at that time mathematical assistant at the University of Turin, who had examined, the year before, the manuscripts of Leibniz preserved in Hannover, and had extracted from them several formulae of logic inserted in the "Formulaire de Mathématiques" of Mr Peano .
Ang aming gawain sa ang lohika ng Leibniz ay halos nakumpleto (hindi bababa sa namin kaya) kapag kami ay ang kasiyahan, at sa International Congress ng Pilosopiya (Agosto, 1900), ng paggawa ng mga kakilala ng Mr Giovanni Vacca, sa panahon na matematiko assistant sa ang University of Turin, na napagmasdan, ang taon bago, ang manuscripts ng Leibniz nakapreserba sa Hannover, at nagkaroon na nakuha mula sa mga ito ng ilang mga formulae ng lohika naipasok sa "Formulaire de Mathématiques" ng Mr Peano.