The Question and Answer section for The Wind in the Willows is a great resource to ask questions, find answers, and discuss the novel.
There are actually two answers to this question. One, commonly used words were different in the early 1900s, when this book was written. Second, words like this expand the vocabulary.... they're educational.
Mole was unsure whether or not the Water Rat would invite him aboard. We know this because he rather "pettishly".
‘Hullo, Mole!’ said the Water Rat.
‘Hullo, Rat!’ said the Mole.
‘Would you like to come over?’ enquired the Rat presently.
Rat and Mole are searching for Otter's son late at night. They dravel down the river when rat seems transfixed and then begins to cry, saying that he heard a beautiful melody that made him extremely happy. A moment later, Mole hears the song, a...