An audience already thoroughly interested awaits this translation of a remarkable book. For years no educational document has been so eagerly expected by so large a public, and not many have better merited general anticipation. That this widespread interest exists is due to the enthusiastic and ingenious articles in McClure's Magazine for May and December, 1911, and January, 1912; but before the first of these articles appeared a number of English and American teachers had given careful study to Dr. Montessori's work, and had found it novel and important. The astonishing welcome accorded to the first popular expositions of the Montessori system may mean much or little for its future in England and America; it is rather the earlier approval of a few trained teachers and professional students that commends it to the educational workers who must ultimately decide upon its value, interpret its technicalities to the country at large, and adapt it to English and American conditions. To them as well as to the general public this brief critical Introduction is addressed. It is wholly within the bounds of safe judgment to call Dr. Montessori's work remarkable, novel, and important. It is remarkable, if for no other reason, because it represents the constructive effort of a woman. We have no other example of an educational system-original at least in its systematic wholeness and in its practical application-worked out and inaugurated by the feminine mind and hand. It is remarkable, also, because it springs from a combination of womanly sympathy and intuition, broad social outlook, scientific training, intensive and long-continued study of educational problems, and, to crown all, varied and unusual experience as a teacher and educational leader. No other woman who has dealt with Dr. Montessori's problem-the education of young children-has brought to it personal resources so richly diverse as hers. These resources, furthermore, she has devoted to her work with an enthusiasm, an absolute abandon, like that of Pestalozzi and Froebel, and she presents her convictions with an apostolic ardour which commands attention. A system which embodies such a capital of human effort could not be unimportant. Then, too, certain aspects of the system are in themselves striking and significant: it adapts to the education of normal children methods and apparatus originally used for deficients; it is based on a radical conception of liberty for the pupil; it entails a highly formal training of separate sensory, motor, and mental capacities; and it leads to rapid, easy, and substantial mastery of the elements of reading, writing, and arithmetic. All this will be apparent to the most casual reader of this book.