1-8
: 1s set, turn RH, cast 1 place & turn LH to face 2nd corners
9-16
: 1s dance 1/2 reel of 4 with 2nd corners, turn 4th corner (2nd corner
  person) RH & turn partner LH to face 1st corners
17-24
: 1s dance 1/2 reel of 4 with 1st corners, turn 3rd corner (1st corner
  person) RH & 3/4 turn partner LH to face out in 2nd place opposite
  sides
25-32
: 1s dance reel of 3 on opposite sides giving LSh to 2nd corner (pstn) 1s
  end in lines across (1L between 3s (at top) & 1M between 2s), all set
33-40
: 3s+1s+2s circle 6H round to left 1/2 way, 1s petronella into 2nd places
  own sides & set

{{explanation}}
2nd time through as new 1s start, original 1s also set, turn RH and cast to bottom (i.e. repeat bars 1-6)