`` it is not that it is wrong , '' temeraire said , `` only it is not so plain as the others - `` `` it is wrong , it is perfectly wrong , '' nitidus cried decidedly , while dulcia pointed out more calmly , `` only consider a moment : if you should begin in dover , and i a little south of london , on the same latitude , and we should then both fly straight northward , we should certainly meet at the pole if we did not mistake our course , so what on earth is the sense of arguing that straight lines will never meet ? ''