ten o'clock
I will go over and take a good look at the rock again , and stick a spear head into the ground , at the point where it seems to me that it goes down straightest , and where there is the least chance of the rope getting rubbed against a sharp edge . I sha 'n' t begin at the wall until tomorrow , for I do n't suppose I shall be able to get out the first few stones without making a bit of a noise , and it would not do to work at night . `` Now , lad , I think we can consider that as all settled , and I wo n't come near you again , unless there is some change of plan . I shall be here tomorrow evening , I hope it will be by ten o'clock -- that must depend upon how long it takes me to get down the outside layer of stone . `` If you should hear a sudden row , make at once for the wall behind the governor 's house , and wait there for me to join you . You see , some of the stones may come down with a run , and if they do I shall give the rest a shove , and be out like a shot . I shall hear which side the sentry is running round the house , and shall belt the other way .