From Charle's Darwin's The Descent of Man, and Selection in Relation to Sex
*Terms and conditions may apply to how based or not Charles Darwin was, depending on the topic and or how you interpret some of his comments. For the most part, he was pretty based though from what I have read, especially for the time.
I love how the text seems to be right from the time where the symbol was already abstract, but it was still used as an et ligature instead of a standalone symbol