Three flasks opened by Pasteur in various localities: left to right: Poupet, Montanvert, Mer de Glace: during his experiments to disprove doctrine of spontaneous generation.

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Three flasks opened by Pasteur in various localities: left to right: Poupet, Montanvert, Mer de Glace: during his experiments to disprove doctrine of spontaneous generation. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.