Four million boys and girls are now enrolled in the high schools of the United States. These young Americans are housed in approximately 25,000 public and 2,800 private high schools. They are being taught by at least 200,000 teachers. These impressive figures alone are perhaps sufficient to explain why the old machinery of education is breaking down. Of necessity, outworn practices are being discarded. Everywhere there is an atmosphere of expectancy, of change and suspense. "What next in secondary education?" has become a slogan that reaches into every nook and corner of the educational edifice. The traditional curricula are being revamped. New objectives are being set up and methods of teaching are being readjusted.