{{explanation}}
 On chord form a circle to bow/cursey across set

1-8
: All circle 8H round & back
9-16
: All set to partner, Petronella turn & set again, all 1/2 turn partner RH
  ready for ...
17-20
: Men dance 1/2 LH across **while** Ladies chase clockwise into partner's
  place, Men 1/2 turn opposite Lady to bring Ladies into centre for ...
21-24
: Ladies dance 1/2 LH across **while** Men chase clockwise into Ladies'
  place, all turn partner RH into square set facing partner
25-32
: All dance 1/2 Grand Chain; all turn partner 2H, all 1/2 turn corner into
  promenade hold facing anticlockwise
33-40
: All promenade anticlockwise to Man's original place (now 1M+2L, 2M+3L,
  3M+4L, 4M+1L)