Which visiting scientists attended Claude-Louis Berthollet’s gatherings at Arcueil?

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At his country home in Arcueil, Claude-Louis Berthollet and the mathematician Pierre-Simon Laplace hosted an informal group known as the Société d’Arcueil. This circle served as a vital creative center for physical and chemical research during the Napoleonic period.1

The active members of this group included:
* Joseph Louis Gay-Lussac2
* Louis-Jacques Thenard2
* Jean-Baptiste Biot2
* Pierre-Louis Dulong2
* Jacques-Étienne Bérard2

In addition to these regular members, the gatherings attracted various visiting scientists who recognized the importance of the laboratory's work, including:
* The German naturalist Alexander von Humboldt2
* The Swiss botanist Augustin de Candolle2
* The British physician Charles Blagden2