This is a reel in the key of G. The tune is also known as Judy Brallaghan.
Chords are C, G and D.
This tune has first- and second-time endings. In the sheet music, the bars marked ’1′ are used the first time you play, and the bars marked ’2′ are for the second time.
Kerr’s collection of merry melodies apparently dates back to the 1870′s. A Google search will return a lot of references.