1- 8 1s cross RH and cast 1 place, 1s dance ½ reel of 3 across (1L with 2s and 1M with 3s)
9-16 1s dance RH across with 1st corners and dance ½ reels of 3 across (1L down and 1M up)
17-24 1s dance RH across with 2nd corners, 1L dances up and casts to 2nd place own side while 1M dances down and casts up to 2nd place
25-32 2s+1s+3s turn RH 1¼ times, set to partners and petronella turn to own sides
(MINICRIB, Dance Crib compiled by Charles Upton, Deeside Caledonian Society, and his successors)
It comes from the Scottish Gaelic: "càrn" (plural càirn).