_Dido and Æneas_ (Vol. iv., p. 423.).--I beg leave to transcribe for A.
A. D. the following passage from the _Facetiæ Cantabrigiensis_, p. 95.
(London, Charles Mason, 1836):
"Porson observing that he could pun on any subject, a person
present defied him to do so on the Latin gerunds, which however he
immediately did in the following admirable couplet:
'When Dido found Æneas would not come,
She mourned in silence, and was DI-DO-DUM.'"
I have also seen these lines attributed to Porson in an old volume of
_The Mirror_. Of any other authorities I have no knowledge.