1-8
: 1s+3s dance RH across & LH back to form facing diagonal lines of 4
  (1s+2s & 3s+4s)
9-16
: All Adv+Ret, 1s+4s & 2s+3s dance 1/2 R&L
17-24
: 1s+3s (now in 4th & 2nd places) dance 1/2 Ladies Chain, 2s+4s (in 3rd &
  1st places) dance 1/2 Ladies Chain
25-32
: All repeat above Fig
33-40
: All Adv+Ret, 1/2 R&L back to original places (repeat of bars 9-16)
41-48
: All Promenade round anticlockwise
49-96
: Repeat from beginning with 2s+4s leading & diagonal lines in other
  direction with 1s+4s facing 2s+3s