80 ON THE MISSISSIPPI. know; and the other was, that he must learn it all over again in a different way every twenty-four hours. Tbat night we had the watch until twelve. Now it was an ancient river custom for the two pilots to chat a bit when the watch changed. "While the relieving pilot put on his gloves and lit his cigar, his partner, the retiring pilot, would say something like this— 'I judge the upper bar is making- down a little at Hale's Point; had quarter twain with the lower lead and mark twain l with the other.' 1 Two fathoms. ' Quarter twain' is 2£ fathoms, three fathoms. feet. < Mark three' is