" The decanter should start with the host and be passed around the table to the left, each gentleman…er, person pouring for whoever is seated on his right. In this case, because we are in the library instead of the dining room, the rules may be relaxed somewhat, I suppose, but the basic form stands. Always pass to the left. When your glass is empty, never ask directly for more. Instead inquire if the person nearest the decanter knows the bishop of Norwich. Any educated chap will know what you mean and pass you the decanter. "

― Tasha Alexander , And Only to Deceive (Lady Emily, #1)