Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The articles on which this book is chiefly based appeared in The Times Educational Supplement during September, October, November and December, 1919. In December, before leaving for Italy, Dr. Montessori wrote the following letter to the Editor of The Times -educational Supplement, which is reproduced here by his permission.