Old John Boldero's tip for making a candle last: put it out. It is a dry little joke dressed up as household advice, from an age when a candle was worth rationing.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
To make your candles last for aye,
You wives and maids give ear-O!
To put them out's the only way,
Says honest John Boldero.
About this rhyme
Text confirms the advice ('to put them out's the only way') is credited to 'honest John Boldero', with no further biographical detail given anywhere in the rhyme.
A little piece of household thrift dressed up as verse: the way to make a candle last is simply to put it out. The rhyme credits the advice to someone called honest John Boldero and tells us nothing more about him.
Blow out an imaginary candle together on the line that gives the advice, not the very last one.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition