26: Natly
for as many as you please, a long dance (presumably longways, as well as lengthy)
mms pages 53 to 55
Playford version: none
Music:
Intro, Part A
1: Lead up [a double]
2: [Fall back a double]
3-4: That again
Intro, Part B
1-2: Set [and turn single, left]
3-4: Set [and turn single, right]
Figure 1, Part A
1: Couples 1 and 2 lead toward each other
2: Fall back from each other
3-4: Couples 1 and 2 change places [in two doubles], couple 1 going between/under/through couple 2
Figure 1, Part B
1-2: Man 1 and woman 2 turn each other all the way around
3-4: Woman 1 and man 2 turn each other all the way around
And so on:
This figure continues in virus-progressive format until everyone is back in their places
Figure 2, Part A
1: Couples 1 and 2 lead toward each other
2: Fall back from each other
3-4: Couples 1 and 2 change places [in two doubles], couple 1 going between/under/through couple 2
Figure 2, Part B
1-2: Couple 2 (who is in couple 1's spot) leads down between couple 1, casts off, and comes around to their new places
3-4: Couple 1 (who is in couple 2's spot) leads up between couple 2, casts off, and comes around to their new places
And so on:
This figure continues in virus-progressive format until everyone is back in their places
Figure 3, Part A
1: Couples 1 and 2 lead toward each other
2: Fall back from each other
3-4: Couples 1 and 2 change places [in two doubles], couple 1 going between/under/through couple 2
Figure 3, Part B
1-2: Couples 1 and 2 take hands around backwards and go all the way around (couple 1 remaining progressed below couple 2)
3-4: Couples 1 and 2 face their partners and set [and turn, left]
And so on:
This figure continues in virus-progressive format until everyone is back in their places
Conclusions:
This is a very nice 3-figure progressive with an introductory figure.  It would seem, considering the format of all 4 figures, that the music is probably a verse-chorus arrangement, AABB in structure, with each strain being 8 counts long.  
Of course, it could simply be a 16-count strain repeated many, many times, but the structure of the progressive figures, especially - with the actual progression happening first, then some kind of filler going on until the next couple is danced with - sort of points to the former being the case.