two am
Of course , her Captain , who understood the use of the charts perfectly , afterwards told Roger to put it down , which he , having carefully taken his observation , did properly . `` How is this ? '' exclaimed the Captain . `` Which of the two am I to believe ? '' `` You may trust me , '' said Roger , firmly . `` My friend , though older , has less experience ; but if you will allow me , I will teach him , and he in a short time will be as useful to you as I am . '' Thus the difficulty was got over , for happily the Captain did not suspect that any trick was being played him .