THE KEY, THE HEART, AND THE DART.
This is a very old-fashioned puzzle, and easy of accomplishment to those who know how to do it. The puzzle is either to arrange the three articles in an apparently inextricable manner, or, if they are so arranged, to separate them without damaging either, or bending the cardboard out of which they should be made.
Cut out of some tough and elastic cardboard a double-headed dart, a key, small at the ring end, and a heart, in which should be cut four angular slits, shaped as in Fig. 18. To arrange them together, the lowermost cut in the heart must be pressed out so that it will form a loop, through which the ring end of the key has to be drawn, and so that one end of the dart may also be passed through without breaking the cardboard. Then fold the dart in the middle, so that one of its heads shall accurately fit upon the other head; bring the loop of the heart back into its former position, drawing it out of the ring of the key, which should then glide down the shaft of the dart, and hang fast held by the head. To disentangle the articles, reverse the order of procedure.