From Leibniz and Georg Ernst Stahl to Albrecht von Haller, Germans of the eighteenth century calved off an experimental physiology from medicine and made this research a centerpiece of their new model university, first under Haller at Göttingen, then under von Humboldt at Berlin. Haller made Göttingen the most important center for the advancement of Enlightenment science in Germany, but that is not where Johann Herder went looking for new ideas in psychology, turning instead to France, avidly studying Condillac and Diderot, and meeting the latter in Paris in 1769. Herder wanted to use French psychology in his theory of how the history of art recapitulates the development of the senses. To work out his ideas he found it necessary to ignore Kant's careful distinction between life and matter. Kant made life an inexplicable boundary for mechanical explanation, though with Herder it became the key concept for interpreting nature. That...

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