seven o'clock in the morning
_ Must _ fall ! '' he exclaimed , starting up suddenly . `` Let us see about that ! It is now seven o'clock in the morning . We must have , therefore , been at least thirty-two hours on the road , and more than half of our passage is already made . If we are going to fall at all , we must be falling now ! I 'm certain we 're not , but , Barbican , you have to find it out ! ''