Tyndall's apparatus for experiments disproving doctrine of spontaneous generation, used here as a culture chamber. A microscope in a horizontal position with artificial illumination, an oil immersion lens, ect. This is the equipment used by Dallinger and Drysdale for their investigations of the life histories of the manads.

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Credit: Tyndall's apparatus for experiments disproving doctrine of spontaneous generation, used here as a culture chamber. A microscope in a horizontal position with artificial illumination, an oil immersion lens, ect. This is the equipment used by Dallinger and Drysdale for their investigations of the life histories of the manads. Wellcome Collection. Source: Wellcome Collection.