Study of embryos and their formation. Historical embryology combined dissection, optical microscopy, comparison of developmental stages and, increasingly, experimental intervention.
Embryologist whose separated sea-urchin blastomeres demonstrated regulatory development in the tested conditions.
Embryologist who used interventions on frog embryos to investigate developmental organization.
Embryologist who investigated fertilization and nuclear participation in the development of embryos.
Embryologist whose 1827 work describes the mammalian ovum.
Progressive formation and differentiation of an organism during biological development, historically contrasted with preformationism. It must not be confused with the modern concept of epigenetics.
The historical view that embryonic development enlarges an already formed organism rather than generating its organization progressively.

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