| Paul Nadar "I am going to write my first philosophical principle, it was not I who formulated it but Malebranche. I have looked hard, but I have not found a better one." 1886 Gelatin silver print J. Paul Getty Museum Object Number: 84.XM.343.19 LL/120520 Marie-Eugène Chevreul posed at a table with an opened ledger.
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