But it was different--this being out in a boat with no oars. Bunny or Sue would never have done that of their own accord, for they knew how easy it was to drift away. And, if they had known the boat was not well fastened, they would have seen to that before they got in, for their father had taught them how properly to tie a knot that would not slip, one that would hold a boat securely and yet one which was easy to loosen.