In my facsimile edition of the 1904 "O'Neill's Music of Ireland" the tune is called "Planxty Fanny Powers." It is in 6/8, in the key of A, and it's marked "Lively."

I wonder if that means fast. On the O'Carolan pieces in the book we see the following notes:

Lively
Spirited
Animated
Moderate
Slow
Very slow
With feeling
With spirit

I guess we could argue for a century about what they mean.