34 such as 168-9 , probably a clumsily intruded couplet , of which the only certain thing that can be said is that it interrupts ( even if its sense were plain ) the natural connexion between 165-7 and 170 ; the question of the expansion ( in this case at any rate skilful and not inapt ) of hrothgar 's giedd , 1724-60 ; and most notably lines 175-88 .