I made a mistake when posting last (that'll teach me to cut-n-paste instead of writing them from scratch!). The third verse of my version, reputedly written by the nurse of the dying girl, actually goes as follows:

How my heart longs to sail away with you---
I would like to sail the ocean blue.
But I must stay here by my window drear
As I watch you sail away from here.

Thanks for your patience... and thanks for having this discussion in the first place! It's neat to hear all the different versions! :D