Studious John Horner,
Of Latin no scorner,
In the second declension did spy
How nouns there are some
Which ending in um
Do not make their plural in i.

Jack and Jill
Have studied Mill,
And all that sage has taught, too.
Now both promote
Jill’s claim to vote,
As every good girl ought to.

— Harper’s, quoted in William T. Dobson, Poetical Ingenuities and Eccentricities, 1882

— Ralph Barton, Science in Rhyme and Without Reason, 1924, reprinted in Scripta Mathemetica, October 1936