Baer, Karl Ernst von

Baer, Karl Ernst von,

1792–1876, Estonian biologist. He was a professor at Würzburg and Königsberg and from 1834 at St. Petersburg. Considered a founder of modern embryology, he discovered the notochord as well as the mammalian ovum. In his History of the Development of Animals (2 vol., 1828–37) he presented the theory of embryonic germ layers (the development of body tissues and organs from definite layers of cells formed in the early embryonic stages) and showed that the development of the embryo in different animals is similar in its early stages. He made these ideas a basis for a general evolutionary theory.
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References in periodicals archive ?
Baer, Karl Ernst von (1828) "Uber Entwickelungsgeschichte der Thiere.
Baer, Karl Ernst von (1836a) "Bitte um eine Nachricht uber die Literaturgeschichte unseres Vater land, besonders an diejenigen Herren gerichtet, welche in den Jahren 1806-1808 in Jena oder Gottingen studiert haben".
Baer, Karl Ernst von (1836b) "Wegen des Grafen von Tredern.
Baer, Karl Ernst von (1873) "Letter to Armand de Quatrefages, 8-12 June 1873".