1-8
: All set, 1s+2s & 3s+4s dance RH across, 1s & 4s cast into centre of
  dance as 2s & 3s dance up or down
9-16
: 1M+4M & 1L+4L dance Petronella-in-tandem to opposite sides
17-24
: 4s dance 1/2 Fig of 8 round 2s as 1s dance 1/2 Fig of 8 round 3s, all
  turn partners 2H & each dancer turns round to right to flow into...
25-32
: All circle 8H round & back.  2 4 1 3