1767 ⟶ Kaspar Friedrich Wolff Argues for Epigenesis
Kaspar Friedrich Wolff argued that the tissues of a developi...
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🐛 Jan Swammerdam studies epigenesis in insects
EpigenesisInsect BiologyJan SwammerdamBiology17th CenturyDevelopmental BiologyNetherlandsEmbryology
Netherlands🐣 Marcello Malpighi describes chick development
Marcello Malpighi published the first description of chick development, including the formation of muscle somites, circulation, and nervous system.⟶
EmbryologyMarcello MalpighiDevelopmental Biology17th CenturyBiologyItalyCirculationNervous System
Italy🐣 Kaspar Friedrich Wolff Argues for Epigenesis
Kaspar Friedrich Wolff argued that the tissues of a developing chick form from nothing and are not simply elaborations of already-present structures in the egg.⟶
BiologyEmbryologyEpigenesisKaspar Friedrich WolffDevelopmental Biology18th CenturyPreformationism
Germany🔬 Lazzaro Spallanzani Disproves Spontaneous Generation and Studies Reproduction
Lazzaro Spallanzani again disproved spontaneous generation by showing that no organisms grow in a rich broth if it is first heated (to kill any organisms) and allowed to cool in a stoppered flask. He also showed that fertilization in mammals requires an egg and semen.⟶
BiologySpontaneous GenerationLazzaro SpallanzaniGerm TheoryReproduction18th CenturyFertilization
Italy