Wordplay
Thurber's love of wordplay can be seen in his coining of several nonsense terms in the story, including the pseudo-medical jargon "obstreosis of the ductal tract", "streptothricosis", and the recurring onomatopoeia of "ta-pocketa-pocketa-pocketa." The medical nonsense that "coreopsis has set in" uses the name of a flower which sounds just like a horrible medical condition.
Read more about this topic: The Secret Life Of Walter Mitty