De ovi mammalium et hominis genesi. Epistolam ad Academiam Imperialem Scientiarum Petropolitanam dedit Carolus Ernestus a Baer. Cum tabula aenea

This is a German-language letter from the biologist Karl Ernst von Baer to the Imperial Academy of Sciences in St. Petersburg. In the letter, von Baer shares his theories about the origins of mammals and humans and describes his observations of the development of embryos. The book also includes an engraved plate that illustrates his findings.

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