a book of riddles (Google Books ⧉, Amazon ⧉, Bookshop ⧉)

Middlemarch

“Now, gentlemen, you who are connoissures, you are going to have a treat. Here is an ingenious contrivance—a sort of practical rebus, I may call it: here, you see, it looks like an elegant heart‐shaped box, portable—for the pocket; there, again, it becomes like a splendid double flower—an ornament for the table; and now”—Mr. Trumbull allowed the flower to fall alarmingly into strings of heart‐shaped leaves—“a book of riddles! No less than five hundred printed in a beautiful red.”