Letter to Robert Dreyfus, 21 March 1908: "I can't lay my hands on the Bernheim, but I can easily reconstruct it if it amuses you. And I've sunk even lower than that. But now it's all over; no more pastiches. What an idiotic excercise."
Selected Letters 2: "Jaques Bernheim (1861-1914), Figaro theatre critic, subject of an unpublished parody the manuscript of which is missing."
Kolb: "Adrien Bernheim, superintendent of the Beaux Arts, founder of Trente ans de théatre."
The Bernheim in question appears to be Adrien Jacques Bernheim.