four o'clock
`` So am I. Let us eat that lunch at once and then start on the return . '' Each had brought a sandwich along , and these were soon consumed and washed down with a drink of cold water from a spring not far away . Then on they went , over the top of the mountain , and along a path which they thought would bring them around its western base . It was now four o'clock , leaving them two hours in which to get back to Putnam Hall . About a third of the distance down the mountain side had been covered , and Sam was slightly in advance , when suddenly he uttered a cry of alarm . `` Look out , Fred ! '' `` What is it ? ''