Teaching and Educational Facilities
  The restaurant in the building at 9a In den Zelten was converted into a lecture hall after Hirschfeld acquired the building in 1921. The hall was named after Ernst Haeckel, whom Hirschfeld had greatly admired  1   3 .

Haeckel was a Social Darwinist and development biologist who spread monism, a new natural philosophy. The admiration shown Haeckel was typical of the enlightening spirit that prevailed at the Institute  2 . Research findings were passed on to members of both the working class and academia in evening classes and weekend and week-long workshops on sexual science  4 . The Haeckel lecture hall, with a supposed capacity of 200, was used for this purpose. In the spirit of the Enlighten-ment and humanism, reference was made to "spiritual giants"--quotations by Goethe, etc., were hung on the walls in and around the Institute--and famous scientists, whose signed portraits hung in the Institute stairwell.

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