Thomas Henry Huxley designated three men as the finest intellects of 19th century natural history: his dear friend Charles Darwin; his most worthy opponent Georges Cuvier; and Karl Ernst von Baer, who discovered the mammalian egg cell in 1827 and wrote the founding treatise of modern embryology in 1828. Of these three, posterity has largely forgotten von Baer, who suffered a severe mental breakdown in the 1830's, but then recovered and moved to Russia (not uncommon for a German-speaking Estonian national), (...) where he enjoyed a distinguished second university career, largely in anthropology and lasting well into the 1870's. (shrink)