A stylistic idiosyncrasy of at least some books in this series was that the author, "Victor Appleton," went to great trouble to avoid repetition of the unadorned word "said", using a different quotative verb, or modifying adverbial words or phrases in a kind of elegant variation. Since many adverbs end in "ly" this kind of pun was originally called a Tom Swiftly, the archetypal example being "'We must hurry,' said Tom Swiftly." At some point, this kind of humor was called a Tom Swifty, and that name is now more prevalent.