The Art of Manliness has reprinted "37 Conversation Rules for Gentlemen" from a 1875 book entitled, A Gentleman’s Guide to Etiquette by Cecil B. Hartley. The rules are still valid!
33. When asking questions about persons who are not known to you, in a drawing-room, avoid using adjectives; or you may enquire of a mother, “Who is that awkward, ugly girl?” and be answered, “Sir, that is my daughter.”
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects