Lillian Eichler,
Book of Etiquette, Volume 2, Part 3…
(1921)
“ Coffee may be served at the table but it is more often served in the drawing-room. USE OF THE NAPKIN What can be more unsightly than a napkin tucked carefully in the top of one's waistcoat.? And still, how often one sees it done among men who believe that they are impressively well-bred! The proper way to use a napkin, whether it is at a formal dinner, or in a restaurant, is to unfold it only half, leaving the center fold as it is and lay it across the knees. It may be used constantly during the meal, whenever the guest finds need for it, but it must never be completely unfolded. ”
