A tale is told in Facetiæ Cantabrigienses of Professor Porson, who being one of a set party, the conversation turned on the subject of punning, when Porson observing that he could pun on any subject, a person present defied him to do so on the Latin gerunds, di, do, dum, which, however, he immediately did in the following admirable couplet: “When Dido found Æneas would not come, She mourned in silence, and was Dido dumb.” […] Nan′di [Nandi].