I've been re-reading L. M. Montgomery's Anne of Green Gables. This snippet about the layer cake Anne made amused me. "I'm sure I haven't forgotten anything this time, Mirella. But do you think it will rise? Just suppose perhaps that baking powder isn't any good. I used it out of the new can. And Mrs Lynne says you can never be sure of getting good baking powder nowadays when everything is so adulterated. Mrs Lynne says the Government ought to take the matter up..."