The first two turns are in Strathspey time, the second two are in Reel time.
Espagnole: both W lead RHJ to M side, cross and cast back to exchanged places while Men cross to W side, lead RHJ back to M side crossing to exchanged places ; all turn P EH (2,1)
Note: on  the original says »RH«, but »BH« is widely used.
Note: Cosh explicitly tells 1c to pass Lsh in [9-24]; however the Rsh pass is quite common, and nicknamed »Mairi's Divorce«.
Repeat pattern until 1c are back at top but allow 5c to finish their turn [96 bars total]
3C Chain Progression was earlier known as Chaperoned Chain Progression
3c & 4c start on opposite side