ten o'clock
She stared calmly at Vandover and said with a peculiar smile , `` I am surprised to see you here , Mr. Vandover . '' An hour later the dance was in full swing . Almost every number was a waltz or a two-step , the music being the topical songs and popular airs of the day set to dance music . About half-past ten o'clock , between two dances , the cornet sounded a trumpet call ; the conversation ceased in a moment , and Henrietta Vance 's brother , standing by the piano , called out , `` The next dance will be the _ first extra _ , '' adding immediately , `` a _ waltz _ . '' The dance recommenced ; in the pauses of the music one heard the rhythmic movement of the feet shuffling regularly in one-two-three time . Some of the couples waltzed fast , whirling about the rooms , bearing around corners with a swirl and swing of silk skirts , the girls ' faces flushed and perspiring , their eyes half-closed , their bare , white throats warm , moist , and alternately swelling and contracting with their quick breathing . On certain of these girls the dancing produced a peculiar effect .