And now the time has come to say good-bye; and good-byes are always so sad that it is much better when we do not know that we have got to say them. It is so long since Beauty and the Beast and Cinderella and Little Red Riding Hood came out to greet you in the 'Blue Fairy Book,' that some of you who wore pigtails or sailor suits in those days have little boys and girls of your own to read the stories to now, and a few may even have little baby grandchildren. Since the first giants and enchanted princes and ill-treated step-daughters made friends with you, a whole new world of wheels and wings and sharp-voiced bells has been thrown open, and children have toy motors and aeroplanes which take up all their thoughts and time. You may see them in the street bending over pictures of the last machine which has won a prize of a thousand pounds, and picturing to themselves the day when they shall invent something finer still, that will fly higher and sail faster than any of those which have gone before it.