Just been and found my old Girl Guide song book. Although all the songs in it were written up later, I probably first sang it when I was a Brownie, in England, in about 1957.

In my handwritten song book I've got 'Doth', crossed out, replaced by 'Down' but I like 'Deck' much better! Otherwise the same words as Ferrara, 3 or 4 posts ago except that I have 'only happen' not 'happen only'. (I notice the first posting to the thread gives both)

Evokes lots of memories for me too.
Sue