You might have to trust Mrs. Byrne here.
Oh, no, I don't! Hrmph. Atomica found a few listings for me, some of which were no longer available (the most promising, of course), and none of which gave any citation; indeed, some had the exact wording of Mrs. B. However, I'm going to give a Univ. of Georgia link, because it has a list of "books for logophiles" at the top. Epicaricacy is given about 11/12ths. of the way down the page, in ext. 62.
http://www.coe.uga.edu/~smago/Vocabulary_Games/Appendixes.pdf