Note: The usual source for Euclid’s First Proposition in Finnegans Wake is usually cited as Isaac Todhunter’s The Elements of Euclid For the Use of Schools and Colleges (Macmillan 1869) but Casey’s edition bears the stamp of the Royal University but was probably still referred to as “Todhunter” - or at least by Joyce whom probably met the earlier edition at Clongowes Wood and certainly refers to it in the phrase ’. ‘—O laughing Sally, are we going to be toadhuntered […] for the rest of our secret stripture?’ (FW293).

Isaac Todhunter, D.Sc., FRS (1820-1884), a celebrated mathematician whose Euclid for schools first appeared in 1862 and was tirelessly reprinted until 1933. (A special edition was made for Indian schools in 1877.)