The teacher should not attempt to teach too much with them. They have been made concrete by the intro duction of details in order to arouse the interest and come within the comprehension of very young children. They should be read rather than studied. Their central theme, the introduction of western civilization, is a matter for reflection when the student has reached the years of maturity. Their present use should be merely to interest and to lay the foundation of facts. It is a pleasure to acknowledge the assistance of Dr. Richard G. Boone, Mr. J. K. Le Baron, Miss Margaret A. Purcell, and Dr. Paul L. Haworth of Teachers' College, Columbia University, who read the manuscript and made many helpful suggestions.
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