What you referenced was a discussion forum. I'm not sure if you really intended to reference the work (A Hog on Ice) that the forum message itself was quoting. In any case though, Wiktionary's servers are located in the US, so they must follow US copyright law. And that law says (I think, I am not American) that copyright lasts until the death of the author plus 70 years. The work was published in 1948, so it can't become public domain until at least 2018 if the author died right when the book was published. It may have been explicitly published in the public domain, though. If that's the case, could you give a link or reference to show that it is?