There is at present a worldwide resurgence of interest in the meaning and importance of children's play. Dr Margaret Lowenfeld was one of the leading figures in child psychology in the years between the two world wars, and her ideas have profoundly influenced our thinking about play in childhood. She recorded these ideas and described her methods in one major book, Play in Childhood, first published in 1935. This new volume in the series Classics in Developmental Medicine faithfully reproduces the original Lowenfeld text, while bringing the references in line with modern practice and presenting the book in a contemporary style. Many of Lowenfeld's techniques described in this book are still available and widely used today: the Lowenfeld Mosaic Test, the Lowenfeld World Technique, Poleidoblocs, and Kaleidoblocs. Lowenfeld's original accounts of these techniques and the thoughts behind them are now available once again to all working with young children, and this book should be of great interest to psychologists, psychiatrists, pediatricians, primary school teachers, and research workers in the field of human development.