During the period from 1857 to 1874 Wundt evolved from a physiologist to a psychologist. In these years he also wrote Grundzüge der physiologischen psychologie (Principles of Physiological Psychology). The two-volume work, published in 1873-1874, stressed the relations between psychology and physiology, and it showed how the methods of natural science could be used in psychology. Six revised editions of this work were published, the last completed in 1911.
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