1-8
: 1s & 3s set, cast 1place, dance 1/2 Fig of 8 round couples above them &
  pass LSh to dance into centre ready for Double Triangles
9-16
: "Petronella Quadruple Triangles" :

: All set as for Double Triangles, 1s & 3s continue as in Double
  Triangles **while** standing couples all petronella turn one place to
  the right & repeat, 1s & 3s end in the middle BtoB with partners
  facing 3rd corner (pstns)
17-24
: 1s & 3s dance 1/2 diagonal reel of 4 with 3rd corners & turn LH 1.1/2
  times to face 1st corner (pstns)  5 1 4 3 2
25-32
: 1s & 3s turn 1st corners RH, partner LH, 2nd corner RH & partner LH to
  end on own sides
33-40
: 5s cast to bottom as 2s dance up to top, 1s+3s set & cast 1 place.
   2 4 1 5 3