"Just give a shout, sir," said the fisherman, who, having been on board a man-of-war in his youth, spoke English.  As he uttered the words he gave a loud hail, the echo coming back with wonderful distinctness.  We all followed his example, and it seemed as if a thousand people were all shouting together in chorus,--the sound at length dying away, apparently many a mile off.  Dick then began to laugh, and immediately a laugh came back, which set us all laughing, and a curious chorus we had, till our jaws began to ache from over-exertion.