Read it through once

As he moved away he saw Lawrence Lefferts, tall and resplendent, leading his wife up to be introduced; and heard Gertrude Lefferts say, as she beamed on the Countess with her large unperceiving smile: "But I think we used to go to dancing-school together when we were children--." Behind her, waiting their turn to name themselves to the Countess, Archer noticed a number of the recalcitrant couples who had declined to meet her at Mrs. Lovell Mingott's. As Mrs. Archer remarked: when the van der Luydens chose, they knew how to give a lesson. The wonder was that they chose so seldom.