but when the echoes had fully ceased , a light laughter at once pervaded the assembly ... and [ they ] smiled as if at their own nervousness ... and made whispering vows , each to the other , that the next chiming of the clock should produce in them no similar emotion ; and then , after the lapse of sixty minutes ... there came yet another chiming of the clock , and then were the same disconcert and tremulousness and meditation as before .