When did Joseph Priestley tell Antoine Lavoisier about dephlogisticated air?

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Portrait of French chemist Antoine Laurent Lavoisier, shown in formal 18th-century attire with a white wig and ruffled cravat, looking slightly to his left. — Antoine Lavoisier Antoine Lavoisier.

Joseph Priestley informed Antoine Lavoisier about his discovery of "dephlogisticated air" in October 1774.1

While Priestley had isolated the gas in August 1774, he traveled to Paris later that year as part of a journey through Europe with his patron, Lord Shelburne. During a dinner held in his honor at the Academy of Sciences, Priestley shared the properties of this new air with his French colleagues, including Lavoisier. Upon learning of these findings, Lavoisier returned to his laboratory to repeat the experiments, which ultimately allowed him to identify the gas as oxygen and complete his revolutionary theory of combustion.21