If a preface is a light which should serve to illumine the contents of a volume, I choose, not words, but human figures to illustrate this little book intended to enter families where children are growing up. I therefore recall here, as an eloquent symbol, Helen Keller and Mrs. Anne Sullivan Macy, who are, by their example, both teachers to myself––and, before the world, living documents of the miracle in education. In fact, Helen Keller is a marvelous example of the phenomenon common to all human beings: the possibility of the liberation of the imprisoned spirit of man by the education of the senses. Here lies the basis of the method of education of which the book gives a succinct idea. If one only of the senses sufficed to make of Helen Keller a woman of exceptional culture and a writer, who better than she proves the potency of that method of education which builds on the senses? If Helen Keller attained through exquisite natural gifts to an elevated conception of the world, who better than she proves that in the inmost self of man lies the spirit ready to reveal itself?