Poem from the inside back cover of a 1913 Memindex Catalog:

JUST JOT IT DOWN.

If you’re going to meet a man<br /> Jot it down<br /> If you’ve got a little plan<br /> Jot it down<br /> If you never can remember<br /> Your requirements for September<br /> ’Till October or November<br /> Jot ’em down.

If you’ve got a note to pay<br /> Jot it down<br /> If its due the first of May<br /> Jot it down<br /> If collections are so slow<br /> That to meet the note you know<br /> You must dun old Richard Roe<br /> Jot it down

If you have a happy thought<br /> Jot it down<br /> If there’s something to be bought<br /> Jot it down<br /> Whether duty calls or pleasure<br /> If you’re busy or at leisure<br /> It will help you beyond measure<br /> Jot it down

If there’re facts that you’d retain<br /> Jot ’em down<br /> If you’ve got to meet a train<br /> Jot it down<br /> If at work or only play<br /> If at home or far away<br /> In the night or in the day<br /> Jot it down

Alexander de Villedieu's Latin grammer Doctrinale from the 12th century was the standard work on the subject. Its 2,000 lines of doggerel were used as a mnemonic device because they were easier to remember. Famed publisher Aldus Manutius was appalled at their crude nature when he reprinted the book in 1501.