Catlin appears to have written an eccentric book, which was in an eighth edition by 1882, entitled Shut Your Mouth. This is a serious essay suggesting that all manner of ills arise in people who were slack jawed, people who do not routinely keep their mouths closed. The title page of the eighth edition says "by George Catlin, author of 'Notes of Travels Amongst the North-American Indians' Etc., Etc."