Wundt taught physiology at Heidelberg, where he acted as assistant to Helmholtz. In 1875, the same year as William James began experimental philosophy at Harvard, he founded his psychological laboratory in Leipzig, where he was newly professor. He did not confine himself to the experimental study of stimuli and sensations, but wrote widely on philosophy, mythology, cultural practices, rituals, literature and art. His ten-volume Völkerpsychologie, published between 1900 and 1920, delineates stages of cultural development, from the primitive, to the totemic, through the age of heroes and gods, to the age of modern man.