Karl Ernst von Baer Quotes

• All new ideas pass through three stages: first they are dismissed as nonsense, then they are rejected as being against religion and finally they are acknowledged as the truth, with the proviso from the initial opponents that they knew it all along.

  Karl Ernst von Baer

  Ideas, Three, Opponents

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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.

  Karl Ernst von Baer

  Science, Thoughtful, Past

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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)

  Karl Ernst von Baer

  Real, Science, Light

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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.

  Karl Ernst von Baer

  Two, Axes, Layers

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• La distinción de los estratos o capas de la membrana embrionaria constituyó un punto de inflexión en el estudio de la historia de la evolución y situó las investigaciones posteriores en su contexto adecuado. Primero se produce una división del embrión (en forma de disco) en una parte animal y otra plástica. En la parte inferior (la capa plástica o vegetativa) hay una capa serosa y otra vascular, cada una de organización peculiar. En la parte superior también (la capa germinal animal o serosa) se distinguen claramente dos capas, una de carne y otra de piel. (1828)

  Karl Ernst von Baer

  Animal, Light, Organization

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