Science and the state in nineteenth century Prussia: M. Norton Wise: Aesthetics, industry & science. Wise goes into a detailed analysis of the Tree of Knowledge that figures so prominently on the certificate, an analysis that tells us how I Bildung i was conceived by members of the Berlin Physical Society. In a very detailed analysis, Wise concludes that the resources Helmholtz employed in his classical paper lay close at hand in the Society (272). [Extracted from the article]