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Karl Ernst von Baer

Karl Ernst von Baer Biography

Scientist

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“The development of the Vertebrate proceeds from an axis upward, in two layers, which coalesce at the edges, and also downward, in two layers, which likewise coalesce at the edges. Thus two main tubes are formed, one above the other. During the formation of these, the embryo separates into strata, so that the two main tubes are composed of subordinate tubes which enclose each other as fundamental organs, and are capable of developing into all the organs.”

TwoDevelopmentCapableFundamentalsEdgesDevelopingOrgansLayersFormationTubesSubordinatesAxesEmbryosVertebrates
Author:Karl Ernst von Baer
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“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. (1828)”

FirstsTwoLightAnimalStudyEvolutionResearchSkinsOrganizationFleshDivisionPeculiarLayersPlasticGermsTurning PointsEmbryosDiscsMembranes
Author:Karl Ernst von Baer
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“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. (1828)”

IdeasRealBodyLightWould BeScienceStepsSourceEvolutionResearchTasksProofEndlessBranchesInvestigationEvery StepCorrelation
Author:Karl Ernst von Baer
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“Know thyself! This is the source of all wisdom, said the great thinkers of the past, and the sentence was written in golden letters on the temple of the gods. To know himself, Linnæus declared to be the essential indisputable distinction of man above all other creatures. I know, indeed, in study nothing more worthy of free and thoughtful man than the study of himself. For if we look for the purpose of our existence, we cannot possibly find it outside ourselves. We are here for our own sake.”

IfsKnowsMenLooksSaidPastSciencePurposeExistenceStudyWrittenSourceCreaturesEssentialsLettersSakeWorthySentencesGoldenThoughtfulDistinctionTemplesThinkerThyselfKnow ThyselfGreat Thinkers
Author:Karl Ernst von Baer
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