1-8
: 2s+3s set, dance in 2s face up & 3s down, dance between end couples &
  cast back to places
9-16
: All Adv+Ret, 1s+2s also 3s+4s dance RH across
17-24
: All circle 8H round to left 1/2 way Adv+Ret
25-32
: 1s+2s also 3s+4s dance LH across & circle 8H round to right 1/2 way
33-40
: 2s+3s cross RH, cast round corners, cross back to places & 2s cast up &
  3s down

{{explanation}}
Repeat once more to return to original places