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Hearty acknowledgments are due to Dr. Goodsell of Teachers College for criticisms; to Professor Kilpatrick of the same institution for criticisms, and for suggestions regarding the order of topics, of which I have freely availed myself, and to Miss Elsie Ripley Clapp for many criticisms and suggestions. The two first named have also been kind enough to read the proof sheets. I am also greatly indebted to a long line of students whose successive classes span more years than I care to enumerate. 去书内
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