Charles Darwin book The Descent of Man, and Selection in Relation to Sex
second edition (1874), chapter XIX: "Secondary Sexual Characters of Man", pages 561-562 http://darwin-online.org.uk/content/frameset?pageseq=584&itemID=F944&viewtype=image<br>Darwin quoted Horace in Latin: "For even before Helen (of Troy) a woman was a most hideous cause of war" <br class="br">The Descent of Man (1871)