In the period that has elapsed between the publication of the Italian and American editions, I have had, with my pupils, the opportunity to simplify and render more exact certain practical details of the method, and to gather additional observations concerning discipline. The results attest the vitality of the method and the necessity for an [Pg viii]extended scientific collaboration in the near future, and are embodied in two new chapters written for the American edition. I know that my method has been widely spoken of in America, thanks to Mr. S. S. McClure, who has presented it through the pages of his well-known magazine. Indeed, many Americans have already come to Rome for the purpose of observing personally the practical application of the method in my little schools. If, encouraged by this movement, I may express a hope for the future, it is that my work in Rome shall become the centre of an efficient and helpful collaboration.To the Harvard professors who have made my work known in America and to McClure's Magazine, a mere acknowledgment of what I owe them is a barren response; but it is my hope that the method itself, in its effect upon the children of America, may prove an adequate expression of my gratitude.Maria Montessori.