What happened was that Aveling's mistress was Marx's daughter, and when both Darwin and Marx were dead, Marx's papers became muddled up with Aveling's papers, and a letter from Darwin saying, "My dear sir, thank you very much but I don't want you to dedicate your book to me," was mistakenly supposed to be addressed to Marx, and that gave rise to this whole myth, which you've probably heard.
Ono što se dogodilo jest da je Avelingova ljubavnica bila Marxova kći i nakon što su Darwin i Marx umrli Marxovi papiri su se pomiješali s Avelingovim i za pismo od Darwina u kojem piše: "Moj dragi gospodine, zahvaljujem Vam, ali ne želim da mi posvetite knjigu" se greškom pretpostavlja da je adresirano na Marxa i to je izvor cijelog ovog mita za koji ste vjerojatno čuli.