one
o'clock
Their blood be on their own heads . '' When Don Paolo had climbed again to his lonely lodging , half an hour later , he pondered long upon what the Cardinal had said to him , and the longer he thought of it , the more truth there seemed to be in the prediction . Gianbattista reached the church in which he was to do his work , and superintended the unloading of the carts . It was but a little after one o'clock , and he expected to succeed in putting up the grating before night . The pieces were carefully carried to the chapel where they were to be placed , and laid down in the order in which they would be needed . It took a long time to arrange them , and the apprentice was glad he had advised Maria Luisa and Lucia to come late . It would have wearied them , he reflected , to assist at the endless fitting and screwing of the joints , and they would have had no impression of the whole until they were tired of looking at the details .