Both books proved very popular, and Darwin was impressed by the general assent with which his views had been received, remarking that "everybody is talking about it without being shocked."
どちらの本も人気があり、ダーウィンは自分の意見が一般に受け入れられたことに感動し「誰でも衝撃を受けることなくそれについて話している」と述べた。