The second edition of the Ormskirk Memorial Edition says (on page 21, under »Some Notes for Teachers«):

>  Bars 9–24::
>    In this sequence of couples crossing the dance and changing places up and down tha [sic]
>    dance, there is some ambiguity as to who should make the arches, and who should dance
>    under them. Again there is a simple rule, which is;
>
>    When going across the dance, the MEN make the arch always and when changing places
>    up and down, THE COUPLE COMING UP THE DANCE PUT THEIR HANDS UP AND THE
>    COUPLE COMING DOWN THE DANCE KEEP THEIR HANDS DOWN. [Emphasis in the original.]
