Karl Ernst von Baer
Karl Ernst Baer
(29 Feb 1792 - 28 Nov 1876)

Prussian-Estonian embryologist who discovered the mammalian egg (1827) and the notochord.

“The History of Evolution is the real source of light in the investigation of organic bodies. It is applicable at every step, and all our ideas of the correlation of organic bodies will be swayed by our knowledge of the history of evolution. To carry the proof of it into all branches of research would be an almost endless task.”
— Karl Ernst Baer (1828)
as quoted in The Evolution of Man, Vol 1, p.48 (1897)
by Ernst Heinrich Philipp August Haeckel

“The distinguishing of the strata, or layers, in the embryonic membrane was a turning-point in the study of the history of evolution, and placed later researches in their proper light. A division of the (disc-shaped) embryo into an animal and a plastic part first takes place. In the lower part (the plastic or vegetative layer) are a serous and a vascular layer, each of peculiar organization. In the upper part also (the animal or serous germ-layer) two layers are clearly distinguishable, a flesh-layer and a skin-layer.”
— Karl Ernst Baer (1828)
as quoted in The Evolution of Man , Vol 1, p.185 (1897)
by Ernst Heinrich Philipp August Haeckel

Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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