The following day was dull and foggy.The Hall was sur rounded by heavy,low clouds,which opened now and then to show the grim,cold moor and its wet,grey rocks.The weather made us miserable.It was difficult to be cheerful when we felt danger all around us.I thougth of Sir Charles'death,and the awful sound of the hound,which I had now heard twice.Holmes did not believe that there was a supernatural hound.But facts are facts,and I had heard a hound.Was there a huge hound living on the moor?If so,where could it hide?Where did it get its food?Why was it never seen by day? It was almost as difficult to accept a natural explanation as a su pernatural explanation.