positivismo By maddiamine 1800 nascita 1800 principi 1800 belle epoque 1849 xxx https://www.google.it/search?ei=O3DRW5_iN9_wgAaUjY6gDQ&q=freemind&oq=freemind&gs_l=psy-ab.3..0i131k1j0j0i67k1j0l7.747226.748519.0.748823.8.8.0.0.0.0.161.1025.1j7.8.0....0...1c.1.64.psy-ab..0.8.998...0i131i67k1j0i10k1.0.KT5eGn4-_Io Period: 1890 to 1914 Belle epoque