Between the ages of seven and thirteen years, the minds of these children are occupied primarily with exploration of the world in which they have recently arrived. They are full of questions of fact, not yet being distracted by the emotional and dynamic interests that come with adolescence and adulthood. This is the golden age of the intellect. Why? How? When? Who? Where? What? are constantly on their tongues, as any parent of a child in our classes will testify. Now, in accordance with the philosophy and psychology which we have tried all too briefly to indicate, a series of "enrichment units" is being worked out at Speyer School day by day in our classrooms. These are being published in the form of teachers' handbooks, in a series designated "The Evolution of Common Things," the first numbers of which have been published. It will take five years to complete the series, at the end of which time we shall know _from experience_ how much knowledge along the lines indicated can be organized and learned by children above 130 IQ in the years of the elementary school. The handbooks, as they appear in published form, will represent the actual work of _the pupils themselves_, guided by the teacher. The teachers did not discover and assemble the materials of instruction, and "give them out." The children did this work. In the end, the teacher organized the total work into an orderly sequence, and verbalized it in final form for presentation. But no teacher would have the time or energy to carry on the work of the school and also collect and compile the materials contained in one of these units. When an area of knowledge has been circumscribed by the children as one chosen for study by class discussion, the teacher participating in the thinking but not leading it, the pupils (there are twenty-five in each class) divide themselves into "committees." These various groups of three to five children each bring special knowledge to the class periods, and all share in the sum total of facts and ideas thus assembled. Libraries are thoroughly utilized in this process. Ninety-five per cent of the pupils who were admitted to our classes in February, 1936 (they were then between the ages of seven and nine), had and were using "library cards" from the New York Public Library. They are taken by their teachers to the nearest branch of the Public Library on days arranged for, and they "look up" their own materials, following the topics listed. Librarians were at first skeptical as to the wisdom of admitting these very young children to the card indices and other facilities of the library. But librarians are an open-minded group, and they were persuaded to let the children try. No difficulty at all has been experienced. Stedman showed long ago that elementary school children of IQ above 140 can use a library and consult reference books as well as students in the normal school do.